Marcus Semien
Marcus Semien
31-Year-Old ShortstopSS
Toronto Blue Jays
2021 Fantasy Outlook
Coming off a monster 2019 season in which he cranked 33 homers, Semien fell back down to Earth in 2020, slashing .223/.305/.374 with seven long balls, 23 RBI and four stolen bases in 53 contests. While his power numbers were down considerably (not unexpectedly) during the shortened season, his .223 batting average was far more concerning, as it was his lowest mark since the 2014 campaign. It was also disappointing to see his K% rise to 21.2% after improving to 13.7% in 2019 during arguably the most successful season of his career at the dish. While there were several concerning stats to point out at the dish a season ago, he turned just 30 in September and could benefit from a move to a robust Toronto lineup. Semien will move to second base after signing a one-year, $18 million deal with the Blue Jays. With eligibility at shortstop, he'll provide someone who can hit for average, put on a display of power or flash his speed on any given day. Read Past Outlooks
RANKSFrom Preseason
#124
ADP
$Signed a one-year, $18 million contract with the Blue Jays in January of 2021.
Homers in loss
SSToronto Blue Jays
September 21, 2021
Semien went 1-for-4 with a two-run home run in Monday's 6-4 loss to the Rays.
ANALYSIS
Semien made the game interesting late after slugging a two-run shot off David Robertson in the ninth to make it a 6-4 ballgame. The 30-year-old has at least a hit in 17 of 19 games and is fourth in baseball with 41 homers. Currently playing on a one-year prove-it contract, all Semien has done this year is prove his worth, as he's slashing .270/.340/.544 with 81 extra-base hits, 97 RBI, 108 runs scored, 15 steals and 63:136 BB:K over 670 plate appearances.
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Batting Stats
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2021
2020
2019
2018
2017
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2020 MLB Game Log
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2019 MLB Game Log
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2018 MLB Game Log
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Batting Order Slot Breakdown
vs Right-Handed Pitchers
vs RHP
#1
#2
#3
#4
#5
#6
#7
#8
#9
62
27
14
1
7
vs Left-Handed Pitchers
vs LHP
#1
#2
#3
#4
#5
#6
#7
#8
#9
26
9
5
1
Left/Right Batting Splits
Since 2019
 
 
+1%
OPS vs LHP
2021
 
 
+15%
OPS vs RHP
2020
 
 
+30%
OPS vs LHP
2019
 
 
+7%
OPS vs LHP
OPS PA R HR RBI SB AVG OBP SLG
Since 2019vs Left .861 442 66 21 62 3 .272 .351 .510
Since 2019vs Right .856 1219 194 60 150 26 .268 .348 .508
2021vs Left .790 188 25 10 30 2 .241 .314 .476
2021vs Right .911 495 84 31 67 13 .278 .349 .561
2020vs Left .835 51 10 4 10 1 .239 .314 .522
2020vs Right .643 180 18 3 13 3 .219 .306 .338
2019vs Left .933 203 31 7 22 0 .309 .394 .539
2019vs Right .876 544 92 26 70 10 .276 .360 .516
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Home/Away Batting Splits
Since 2019
Even Split
2021
 
 
+3%
OPS at Home
2020
 
 
+61%
OPS on Road
2019
 
 
+8%
OPS at Home
OPS PA R HR RBI SB AVG OBP SLG
Since 2019Home .856 807 135 37 93 15 .266 .351 .505
Since 2019Away .858 854 125 44 119 14 .272 .347 .512
2021Home .889 327 56 20 47 7 .268 .336 .553
2021Away .866 356 53 21 50 8 .268 .343 .524
2020Home .521 111 14 2 5 2 .180 .261 .260
2020Away .841 120 14 5 18 2 .264 .350 .491
2019Home .928 369 65 15 41 6 .292 .390 .538
2019Away .857 378 58 18 51 4 .277 .349 .507
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Stat Review
How does Marcus Semien compare to other hitters?
This section compares his stats with all batting seasons from the previous three seasons (minimum 400 plate appearances)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity and Barrels/PA % are benchmarked against 2019 data (min 400 PA) and Hard Hit Rate is benchmarked against last season's data (min 400 PA). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • BB/K
    Walk to strikeout ratio
  • BB Rate
    The percentage of plate appearances resulting in a walk.
  • K Rate
    The percentage of plate appearances resulting in a strikeout.
  • BABIP
    Batting average on balls in play. Measures how many of a batter’s balls in play go for hits.
  • ISO
    Isolated Power. Slugging percentage minus batting average. A computation used to measure a batter's raw power.
  • AVG
    Batting average. Hits divided by at bats.
  • OBP
    On Base Percentage. A measure of how often a batters reaches base. Roughly equal to number of times on base divided by plate appearances.
  • SLG
    Slugging Percentage. A measure of the batting productivity of a hitter. It is calculated as total bases divided by at bats.
  • OPS
    On base plus slugging. THe sum of a batter's on-base percentage and slugging percentage.
  • wOBA
    Weighted on-base average. Measures a player's overall offensive contributions per plate appearance. wOBA combines all the different aspects of hitting into one metric, weighting each of them in proportion to their actual run value.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Hard Hit Rate
    A measure of contact quality from Sports Info Solutions. This stat explains what percentage of batted balls were hit hard vs. medium or soft.
  • Barrels/PA
    The percentage of plate appearances where a batter had a batted ball classified as a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
BB/K
0.47
 
BB Rate
9.5%
 
K Rate
20.2%
 
BABIP
.282
 
ISO
.270
 
AVG
.268
 
OBP
.340
 
SLG
.538
 
OPS
.877
 
wOBA
.378
 
Exit Velocity
83.4 mph
 
Hard Hit Rate
36.5%
 
Barrels/PA
7.5%
 
Advanced Batting Stats
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Additional Stats
Games By Position
Defensive Stats
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Batted Ball Stats
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Stats Vs Upcoming Pitchers
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Recent RotoWire Articles Featuring Marcus Semien
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4 days ago
Erik Halterman uses this week’s column to talk about players who have impressed him the most this year, including A’s first baseman Matt Olson.
DraftKings MLB: Monday Breakdown
11 days ago
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14 days ago
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DraftKings MLB: Thursday Breakdown
15 days ago
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DraftKings MLB: Monday Breakdown
18 days ago
Mike Barner digs into Monday's DraftKings offering, turning back to a Blue Jays stack against the Yankees.
Past Fantasy Outlooks
2020
2019
2018
2017
2016
2015
2014
Semien enjoyed a monster year in 2019 for the resurgent Athletics. He has always strived to play every day, and he's done that the past two years with consecutive seasons of 700-plus plate appearances. Yes, the run production was a noticeable difference for him last year, but he changed his approach at the plate and greatly reduced his strikeout rate from the low 20s to 14% in just two seasons. Semien pushed his average exit velocity up by two miles per hour over 2018, but the launch angle did not change, so this big surge is a credit to his overall approach rather than any one change. Projecting a third season of 700-plus plate appearances would be very dangerous, and the 2019 season really stands out from the consistently average production Semien had from 2015-2018. The real Semien is in between those two stat lines. If you project another level for him, you're saying he's a top-10 player.
Want to win a bet? Ask, "What nine players have double-digit homers and steals each of the last four seasons?" Most would miss Semien. Granted, his totals lag behind the others, but there's something to be said for reliability and consistency in today's landscape. Semien is two years removed from 2016's 27 homers, rendering it a likely outlier. The rest of his skill set is stable, save for an improving contact rate. This bodes well for a batting average limited by a weak hard-hit rate, supported by Statcast's exit velocity and barrels data. One element of Semien's game that's improved greatly is defense. Once a major liability, Semien's range and throwing took a huge step forward this past season, ingraining him at shortstop for the foreseeable future. A winning fantasy roster is about balance. Semien doesn't excel in any particular category, but his reliability offers roster stability so you can take chances elsewhere.
After hitting 27 home runs and stealing 10 bases in 2016, Semien missed 74 games in the first half of 2017 after undergoing surgery to repair a fractured bone in his right wrist. He did his best to erase doubts about his power potential afterward, though, clubbing all 10 of his home runs from last season over the final 74 games. While it doesn't appear that he'll put together a helpful batting average anytime soon - too many strikeouts and flyballs - his walk rate has improved in each of the last two seasons while his strikeout rate has remained almost flat. He's also stolen 10-to-12 bases in his last three seasons, which helps offset his plate woes. Many will fear his cavernous home ballpark, but he doesn't have drastic splits over his career. His improved defense since his horrible 2015 should keep him in a starting spot for Oakland, or whomever they may trade him to. Power-speed combos in the middle infield rarely price themselves as cheap as Semien should be on draft day.
Investors in Semien for 2016 cashed in as he set career highs in plate appearances, home runs, RBI, runs scored and slugging percentage, while he reached double-digit stolen bases for the second straight year. Even his former hatchet-job defense has improved, which should lock him into the lineup, where he mostly hit toward the top down the stretch last year. His production dipped in the second half, but the 19 first-half home runs linger as a reminder of his upside. To reach the next level, the 26-year-old must show he can do anything in the batting average column, which on the back of his weak batting eye and flyball profile doesn't look like an immediate avenue for growth. Speculators are better off hoping he steals more bags if he continues to bat near the top of the order. For owners who can take the batting average hit, Semien will settle in as a midrange shortstop in mixed leagues who could repeat his returns from last year.
Semien, acquired by Oakland in the Jeff Samardzija trade, was slotted into the lineup as the everyday shortstop for the A's. He started the season hot, then struggled in June and July before righting the ship down the stretch. The final product of all those ups and down was useful especially when factoring in his eligibility at three infield positions. The big issue was the astounding numbers of errors he made at shortstop. Semien led all of baseball with 35 errors, eight more than anyone else at any position, but he improved a lot after the A's hired Ron Washington to tutor Semien at short. After a brutal 28 errors in 89 games before the All-Star break, he only made the seven the rest of the season. That second half may have saved Semien's role heading into 2016, and as a speed/power combo at a middle-infield position, his stock may rise steadily throughout the spring.
Expectations were fairly high for Semien entering the 2014 season after he get on base at over a .400 clip between Double-A and Triple-A in 2013. Unfortunately, he might have been rushed to the major leagues too early. Semien was the White Sox's Opening Day second baseman after Gordon Beckham got hurt and served in a utility role after Beckham returned. Semien struck out in 31 percent of his plate appearances, hardly walked and was back at Triple-A Charlotte by June 2. However, the A's saw something they liked and included him in a trade for Jeff Samardzija. In an ideal world, he plays regularly while posting doubles power and an above-average OBP. He'll get a chance to prove he can do that, as he's expected to compete for the starting shortstop job in Oakland.
Semien is the latest White Sox prospect to run the minor league gamut. He finished 2012 in virtual obscurity at High-A, but he found his way into 21 September contests for the big league club. Stellar plate discipline helped him make is way to the top (98:90 BB:K in 137 minor league games), but this skill faded a bit against better pitching (1:22 BB:K in his September audition). His struggles continued into the Arizona Fall League, and he likely needs a bit more seasoning before he is ready for a regular MLB role. Still, the White Sox's lack of depth at third base could force him into action at some point again in 2014.
More Fantasy News
Hits homer No. 40
SSToronto Blue Jays
September 18, 2021
Semien went 1-for-5 with a solo home run in Saturday's 6-2 win over the Twins.
ANALYSIS
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Socks three-run homer
SSToronto Blue Jays
September 12, 2021
Semien went 1-for-4 with a three-run home run in Saturday's 11-2 win in Game 2 of the doubleheader against the Orioles.
ANALYSIS
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On base four times in win
SSToronto Blue Jays
September 9, 2021
Semien went 2-for-3 with two walks, two RBI and a run Wednesday in the Blue Jays' 6-3 win over the Yankees.
ANALYSIS
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Homer barrage continues
SSToronto Blue Jays
September 8, 2021
Semien went 2-for-3 with a walk and a solo home run in Tuesday's 5-1 win over the Yankees.
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Two more blasts Monday
SSToronto Blue Jays
September 6, 2021
Semien went 2-for-5 with two home runs and five RBI in Monday's 8-0 win over the Yankees.
ANALYSIS
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