Magneuris Sierra
Magneuris Sierra
23-Year-Old OutfielderOF
Miami Marlins
Injury Hamstring
Est. Return 3/1/2020
2019 Fantasy Outlook
Acquired by the Marlins last winter, the defensive-minded Sierra opened the 2018 campaign with Triple-A New Orleans, looking to improve his on-base skills so he can take advantage of his 70-grade speed. Unfortunately, things did not go well as Sierra's plate skills fell back from his Double-A marks, registering a 2.8 BB% along with a 25.0 K% in 367 PA with the Baby Cakes. Despite a scant .628 OPS at the time, Sierra was summoned to South Beach after the All-Star break and took over in center field. Sierra held the job for most of the second half even though he slashed an anemic .190/.222/.211 in 156 PA, with only three steals in five attempts. The Marlins are still in rebuild mode while Sierra has options left, so if he fails to impress in the spring, he could be looking at another stint at Triple-A until he demonstrates the ability to get on base at an acceptable clip. Read Past Outlooks
RANKSFrom Preseason
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Likely to miss remainder of season
OFMiami Marlins
September 22, 2019
Sierra (leg) was diagnosed with a mild left hamstring strain after the team's win over the Nationals on Sunday and is not expected to play again this season, Jordan McPherson of the Miami Herald reports.
Sierra exited the game against the Nationals on Sunday in the top of the eighth inning and later learned that he strained his left hamstring. The Marlins' final game is next Sunday, and Sierra doesn't figure to be back in time. The young left fielder will rehab and transition his focus to getting ready for the 2020 season.
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Batting Stats
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Batting Order Slot Breakdown
vs Right-Handed Pitchers
vs RHP
vs Left-Handed Pitchers
vs LHP
Left/Right Batting Splits
Since 2017
Since 2017vs Left .877 37 4 0 4 0 .417 .432 .444
Since 2017vs Right .498 225 21 0 9 8 .218 .257 .242
2019vs Left 2.000 2 0 0 0 0 1.000 1.000 1.000
2019vs Right .745 40 5 0 1 3 .316 .350 .395
2018vs Left .745 22 1 0 2 0 .333 .364 .381
2018vs Right .381 134 9 0 5 3 .167 .198 .183
2017vs Left .923 13 3 0 2 0 .462 .462 .462
2017vs Right .610 51 7 0 3 2 .277 .333 .277
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Home/Away Batting Splits
Since 2017
OPS on Road
OPS on Road
OPS on Road
OPS on Road
Since 2017Home .490 126 8 0 6 4 .212 .244 .246
Since 2017Away .611 136 17 0 7 4 .279 .316 .295
2019Home .760 19 2 0 1 2 .278 .316 .444
2019Away .844 23 3 0 0 1 .409 .435 .409
2018Home .417 86 5 0 3 1 .188 .217 .200
2018Away .452 70 5 0 4 2 .194 .229 .224
2017Home .536 21 1 0 2 1 .250 .286 .250
2017Away .745 43 9 0 3 1 .350 .395 .350
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Stat Review
How does Magneuris Sierra 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 this season's data (min 200 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.
    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 Rate
K Rate
Exit Velocity
86.7 mph
Hard Hit Rate
Advanced Batting Stats
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Additional Stats
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Defensive Stats
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Past Fantasy Outlooks
Sierra already has 64 MLB plate appearances despite the fact that he still hasn't mastered Double-A as a hitter. That usage is a bit unfortunate from a developmental perspective, as Sierra was getting rushed by the Cardinals, playing just 20 games at High-A and struggling to make an impact with his bat at Double-A in between brief MLB callups. Thankfully, that usage will be put to an end after he was dealt to the Marlins as part of the package that sent Marcell Ozuna to St. Louis. The elite defensive center fielder will likely be sent back to Double-A, where he can refine his offensive game, as the Marlins won't be contending anytime soon. He remains a 70-grade runner and excellent contact hitter, so he could end up being a poor man's Billy Hamilton in a few years. While the trade may delay his permanent ascent to the big leagues, it will likely work out better for his development in the long run. He could take over as the Marlins' everyday center fielder at some point in the coming years, and could even develop a little power with his new organization.
Sierra has been an enticing prospect ever since he made his stateside debut in 2013, but last year was the first time he lived up to that promise in a full-season league. He showed that he wasn't ready for Low-A in 2015, but he spent all of 2016 with Peoria and the results were outstanding. Sierra stole 31 bases while notching 36 extra-base hits. He is one of those players whose movements on the field stand out, even to the untrained eye. Sierra combines plus-plus speed with an all-fields approach. As he continues to mature physically, more of his doubles will start going for home runs. The primary concern regarding his chances of being a leadoff hitter at the highest level is his low walk rate, but he is such a good baserunner that he still led the Midwest League with 78 runs. This is a prospect worth targeting in dynasty leagues before the entire package starts to come together as he moves closer to the big leagues.
Sierra’s backers were forced to pump the brakes when he failed an optimistic assignment to Low-A Peoria at the outset of the 2015 season. The athletic outfielder hit .191/.219/.247 with a 27.4% K-rate in 190 plate appearances before he was mercifully re-assigned to rookie level Johnson City. However, the 19-year-old then quickly reminded everyone why he was the Cardinals’ Minor League Player of the Year in 2014. He turned in a .765 OPS with three home runs and 15 steals while cutting his K-rate to 17.6% in 239 plate appearances with Johnson City. Despite failing his first assignment to a full-season league, he proved in the second half that the tools of an across-the-board fantasy contributor are still present. Plus speed and an above-average hit tool highlight the package, but many believe more game power will show as he matures. This year it will be important for Sierra to show that he is ready to handle Low-A pitching in his age-20 season.
More Fantasy News
Exits with leg injury
OFMiami Marlins
September 22, 2019
Sierra was pulled from Sunday's game against the Nationals in the top of the eighth inning with an apparent left leg injury, Joe Frisaro of reports.
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Swipes two bags
OFMiami Marlins
September 11, 2019
Sierra went 2-for-3 with one RBI and two stolen bases in Wednesday's loss to the Brewers.
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Benched for third straight
OFMiami Marlins
September 9, 2019
Sierra is out of the lineup for Monday's game against the Brewers, Joe Frisaro of reports.
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Joins big-league squad
OFMiami Marlins
September 3, 2019
Sierra was recalled from Triple-A New Orleans on Tuesday, Andre Fernandez of The Athletic reports.
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Sent to Triple-A
OFMiami Marlins
March 8, 2019
Sierra was optioned to Triple-A New Orleans, Andre Fernandez of The Athletic reports.
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