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Relief Pitcher · Chicago Cubs

Aaron Bummer

LHP · Throws Left · Age 32Reliever
ERA
7.63
FIP
–
IP
15.1
W-L
1-1
WHIP
1.83
K%
16.9
BB%
13.0
GB%
–
K/9
7.6
HR/9
3.5
Drafted by the Chicago White Sox in 2014 (round 19), he was signed by the Chicago Cubs in free agency in June 2026. He made his MLB debut on July 27, 2017.Facts: MLB StatsAPI (people · transactions)
No scheduled start today. The model projection and lineup matchup appear on start days.

Sinker

SI · lead pitch

36% of pitches · .342 xwOBA allowed · 197 BIP · where it goes, what it costs

Pitcher Locations
where he throws it · catcher’s view
0%1%1%0%1%2%3%5%3%3%7%11%15%14%8%2%3%5%2%1%3%3%5%1%1%
Rare 0% · Common 10% · Very common 20%+
xwOBA Allowed
damage done by zone · all batters
––.590–.559.691.061.280.315.227.278.268.326.348.257.157.327.442.199.269.701.687.387.121.691
Cold .200 · Avg .310 · Hot .500+
Expected Damage
locations × damage zones
––.005–.004.010.002.013.009.007.018.030.050.048.020.004.010.020.004.002.022.023.020.001.007
Low risk · Average · High-risk zone
Sinker (36% usage) has allowed .342 xwOBA over 197 balls in play — his most-used pitch.

Arsenal

usage × whiff, ranked

6 pitch types · 2,225-pitch sample · 2026/2025/2024 blend, weighted 4/3/1

Sinker SI
36% usage · 10% whiff · .342 xwOBA · 90.2 mph
Curveball CU
26% usage · 27% whiff · .332 xwOBA · 80.1 mph
Sweeper ST
22% usage · 37% whiff · .234 xwOBA · 80.5 mph
Four-Seam Fastball FF
11% usage · 16% whiff · .442 xwOBA · 90.6 mph
Cutter FC
4% usage · 22% whiff · .279 xwOBA · 87.6 mph
Unknown UN
1% usage
Whiff% Trend
last 8 outings · by pitch · min 5 swings per point
30405060704/264/284/305/35/45/85/145/18
SinkerCurveballSweeper
Hand Splits
K% + xwOBA allowed by batter side · 2026/2025/2024 blend, weighted 4/3/1
SplitK%xwOBASample
vs. LHB23.3 .291 228
vs. RHB20.6 .352 316
Live · client-hydrated

Market lines

current pick’em lines by book · updates through the day

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Live · client-hydrated

DFS picks

today’s picks for this pitcher, probability-sorted · graded nightly

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