Aaron Bummer
26-Year-Old PitcherRP
2019 Fantasy Outlook
After vaulting up the organizational ladder in 2017, Bummer was rewarded with an Opening Day roster spot. Early on, the southpaw was used almost exclusively in one- or two-batter stints, largely as a specialist. The results were promising, as he posted a 3.26 ERA and a 21:6 K:BB in 19.1 frames before being shuttled back to the minors. He returned to the big leagues for the month of September and was touched up a bit to the tune of eight runs in 12.1 innings. Despite the struggles at the end, 2018 was largely a success for the 25-year-old. His 65:21 K:BB in 61.2 innings between the majors and minors was strong, and he held left-handed hitters to a .245 batting average. Plus, his 2.44 FIP fell well below his 4.26 ERA for the season, suggesting he was the subject of some bad luck. He figures to have a role in the middle innings in 2019. Read Past Outlooks
RANKSFrom Preseason
Add To Watchlist
Picks up 16th hold
PChicago White Sox
August 16, 2019
Bummer tossed two scoreless innings and struck out one in Friday's 7-2 win over the Angels.
ANALYSIS
The performance earned Bummer his 16th hold of the year. Bummer has allowed two runs on nine hits and two walks across six appearances in August, striking out seven in that span. For the year, the set-up man has a 1.65 ERA and 0.96 WHIP in 49 innings pitched, adding a 42:15 K:BB. He's still unlikely to see many save chances behind closer Alex Colome.
Read More News
Pitching Stats
Loading Pitching Stats...
MLB Game Log
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
FantasyDraft
Head2Head
Loading Pitching Game Log...
Minor League Game Log
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Pitching Appearances Breakdown
Average Pitch Count
18
Last 10 Games
17
Last 5 Games
12
How many pitches does Aaron Bummer generally throw?
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
What part of the game does Aaron Bummer generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2017
 
 
-16%
BAA vs LHP
2019
 
 
-5%
BAA vs LHP
2018
 
 
-28%
BAA vs LHP
2017
 
 
-9%
BAA vs LHP
BAA Batters K BB H 2B 3B HR
Since 2017vs Left .196 199 44 13 36 6 0 3
Since 2017vs Right .234 298 68 36 60 5 1 6
2019vs Left .178 94 21 4 16 2 0 1
2019vs Right .188 168 39 20 27 2 0 3
2018vs Left .245 57 15 3 13 3 0 0
2018vs Right .338 87 20 7 27 2 1 1
2017vs Left .171 48 8 6 7 1 0 2
2017vs Right .188 43 9 9 6 1 0 2
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2017
 
 
-48%
ERA at Home
2019
 
 
-27%
ERA at Home
2018
 
 
-63%
ERA at Home
2017
 
 
-63%
ERA at Home
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2017Home 2.23 1.02 68.2 1 3 1 8.5 2.8 0.8
Since 2017Away 4.27 1.42 52.2 0 1 0 8.0 4.8 0.5
2019Home 1.80 1.03 35.0 0 0 1 8.0 3.3 0.8
2019Away 2.48 0.95 32.2 0 0 0 8.0 3.0 0.3
2018Home 2.66 0.98 20.1 0 1 0 10.2 0.9 0.4
2018Away 7.15 2.65 11.1 0 0 0 9.5 6.4 0.0
2017Home 2.70 1.05 13.1 1 2 0 7.4 4.1 1.4
2017Away 7.27 1.62 8.2 0 1 0 6.2 9.3 2.1
More Splits View More Split Stats
Stat Review
How does Aaron Bummer compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. 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, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in 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.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
2.50
 
K/9
8.0
 
BB/9
3.2
 
HR/9
0.5
 
Fastball
95.6 mph
 
ERA
2.13
 
WHIP
0.99
 
BABIP
.230
 
GB/FB
4.67
 
Left On Base
81.4%
 
Exit Velocity
89.4 mph
 
Barrels/BBE
2.4%
 
Spin Rate
2028 rpm
 
Balls Hit 95+ MPH
39.5%
 
Swinging Strike
10.6%
 
Advanced Pitching Stats
Loading Advanced Pitching Stats...
Defensive Stats
Loading MLB Defensive Stats...
Stats Vs Today's Lineup
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
Recent RotoWire Articles Featuring Aaron Bummer
Oak's Corner: Second Half Cat Attack
81 days ago
Scott Jenstad targets players for each 5x5 category who are each owned less than 50 percent in NFBC 12-team leagues, who might be good adds, including Albert Pujols in the RBI category.
Regan's Rumblings: Trade Deadline Predictions
84 days ago
As the trade deadline approaches, Dave Regan offers 10 predictions on what might happen over the next few days including Nicholas Castellanos’ possible move.
Oak's Corner: Dealing With Pitching in an Offensive Era
88 days ago
Scott Jenstad says the 2019 home run craze is just getting warmed up and questions how to deal with it from a fantasy angle. He also examines Shohei Ohtani’s pitching future.
Oak's Corner: Are Sonny Days Here Again?
102 days ago
Scott Jenstad heads into the All-Star Break with hopes that Reds pitcher Sonny Gray is back to his pre-New York pitching ways.
The Long Game: The Shape of Saves to Come
103 days ago
Erik Siegrist points out relievers who could inherit closer roles after the trade deadline and thinks the Giants' Reyes Moronta has the potential to someday become one of the league's best ninth-inning men.
2018 Fantasy Outlook
Last season marked the first complete campaign for Bummer since he underwent Tommy John surgery in 2015. The White Sox started him at High-A, and he pitched at four levels last season while eventually getting the call to Chicago. In the minors, he struck out a batter per inning at each of his three stops, but he struggled to miss bats as a big-league reliever in his debut. Additionally, his walk rate spiked to a career-worst 6.1 BB/9, which kept the White Sox from relying on him in high-leverage spots. There are a few positives, however, including a track record of better control and his ability to get outs on the ground (54.4 percent groundball rate). With a low-90s fastball and slider combo, Bummer should get more opportunities to stick with the White Sox in 2018, but he may wind up bouncing between Charlotte and Chicago if he fails to cut back on the free passes.
More Fantasy News
No runs allowed in second half
PChicago White Sox
July 28, 2019
Bummer walked one in a scoreless two-thirds of an inning in Saturday's 5-1 win over the Twins.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Earns 10th hold
PChicago White Sox
July 8, 2019
Bummer allowed a solo home run and a walk over two innings to pick up the hold in Sunday's 3-1 win over the Cubs.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Has closing stuff per manager
PChicago White Sox
June 30, 2019
White Sox manager Rick Renteria feels Bummer can be a closer, David Just of the Chicago Sun-Times reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Nets first save
PChicago White Sox
June 13, 2019
Bummer tossed a scoreless ninth inning to pick up the save against the Yankees on Thursday, allowing one hit while striking out two.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Preserves Giolito's win
PChicago White Sox
June 9, 2019
Bummer got the only batter he faced to earn his fourth hold in Saturday's 2-0 win over the Royals.
ANALYSIS
Subscribe now to instantly reveal our take on this news.