← CHC at BOS, Sep 25, 2026
4:35 PM CT · Fenway Park · lineup confirmed
Hitter · BOS · batting 8Isiah Kiner-Falefa
Bats rightTalent grade FBalancedCold
.269wOBA vs LHP.286xwOBA vs his mix3.4expected PA
Starter · CHCDavid Peterson
Throws leftBTB Stuff 96Trending Up
5.1projected K21%K%1.9trips vs this hitter
David Peterson's pitches, by how they moveHitter's edgeEvenPitcher's edge
-20-100+10+20-20-100+10+20Arm side →← Glove side↑ Rise (in)Sinker: 31% usage, 92.3 mph, +13.6″ arm side, +8.4″ rise. Isiah Kiner-Falefa: wOBA .354 vs league .361 (about even).Sinker 31%Fastball: 26% usage, 92.8 mph, +2.3″ arm side, +11.6″ rise. Isiah Kiner-Falefa: wOBA .337 vs league .343 (about even).Fastball 26%Slider: 19% usage, 86.6 mph, -2.8″ arm side, +3.1″ rise. Isiah Kiner-Falefa: wOBA .304 vs league .310 (about even).Slider 19%Changeup: 15% usage, 85.6 mph, +13.2″ arm side, +3.6″ rise. Isiah Kiner-Falefa: wOBA .313 vs league .320 (about even).Changeup 15%Curveball: 8% usage, 80.0 mph, -4.1″ arm side, -8.6″ rise. Isiah Kiner-Falefa: wOBA .297 vs league .303 (about even).Curveball 8%

Bubble size is how often he throws it. Color is Isiah Kiner-Falefa's wOBA against pitches shaped like it, compared with league. Hover a pitch for the numbers; the table below has all of them.

MarketBTBWithout the matchupMatchup
1+ hit55.5%55.2%+0.3
2+ total bases25.8%25.7%+0.1
Home run2.6%3.1%-0.5
Matchup: points this starter, his pitch mix, the bullpen and the park add or take away, against the same hitter over the same trips facing league-average opposition. "Without the matchup" takes them back out.
What moves the number
1+ hit
Starter
+0.1
Pitch mix
-0.2
Bullpen
+0.1
Park
+0.3
2+ total bases
Starter
+0.0
Pitch mix
-0.2
Bullpen
+0.1
Park
+0.2
Home run
Starter
-0.2
Pitch mix
-0.0
Bullpen
+0.0
Park
-0.3

Points each piece adds or takes away. The pitch-mix piece is folded into the fitted model when it scores the pair, so it often reads zero.

Pitch by pitch

Isiah Kiner-Falefa against each of David Peterson's pitches
His pitchUsageVeloMovementHis wOBALeagueHis whiff%LeagueSampleRead
Sinker31%92.3+14″ / +8″.354.36113.4%14.5%5Little history vs this shape
Fastball26%92.8+2″ / +12″.337.34316.3%17.6%4Little history vs this shape
Slider19%86.6-3″ / +3″.304.31025.4%25.7%3Little history vs this shape
Changeup15%85.6+13″ / +4″.313.32025.9%28.2%3Little history vs this shape
Curveball8%80.0-4″ / -9″.297.30329.2%29.6%3Little history vs this shape
Matched by shape: every pitch in our history that moved like each of the starter's pitches, not just ones with the same name. Movement is horizontal / induced vertical break in inches. Display only; the fitted model reads the matchup its own way.

Statcast

opens on left-handers, the hand he faces tonight

No pitch-level data for this hitter in the current window.

FormCold
Contact rating–percentile of xwOBA
Last 100 pitches–
wOBA / xwOBA.172 / .226running 54 points behind his contact
Last 12 games, oldest to newest
Hit4/12
2+ total bases1/12
Home run0/12

Context only. Streaks and hot or cold labels don't move a projection: in our tests recent results didn't predict the next two weeks better than the season.

Two strikes

David Peterson CHC · LHPwith two strikes
David Peterson with two strikes. Put-away: share of two-strike pitches that end the at-bat with a strikeout.
PitchOverall2 strikesWhiff%Put-awayLeague put-away
Fastball26%30%20.3%17.7%18.6%
Slider19%30%25.0%17.1%21.6%
Sinker31%18%14.6%13.6%17.7%
Changeup15%15%18.5%19.6%18.3%
Curveball8%7%50.0%32.0%21.2%
Other0%0%–100.0%14.3%
Isiah Kiner-Falefa bats Rwith two strikes, vs this hand
Isiah Kiner-Falefa with two strikes against this hand, shrunk toward league. Little two-strike history vs these shapes
With two strikesHimLeague
K%42.5%41.5%
Whiff%22.1%21.6%
Contact%77.9%78.4%
Chase%40.9%39.9%
wOBA.235.245
Whiff vs his put-away shapes20.6%20.2%

The hitter

season-level talent read
Talent gradeFBalanced type
wOBA.286
K%19.1%
BB%6.1%
Whiff%9.7%
Barrel%1.7%
Hard-hit%21.7%
Avg EV83.8

Against left-handers, last 90 days

13 PA
wOBA.269
xwOBA vs this mix.286against pitches like his
RV/100-1.01
Hard-hit%21.7%
K%23.9%
BB%9.5%

Talent blends this season with last season, shrunk toward league average where the sample is thin. Recent hot or cold streaks are not weighted: in our tests they didn't predict the next two weeks better than the season does.

The starter he faces
David PetersonLHP · CHC vs BOS
5.1projected strikeouts · likely 2 to 8 · 22.5 batters over 5.2 innings
≤3 strikeouts: 25.7%26%≤34 strikeouts: 17.2%17%45 strikeouts: 17.4%17%56 strikeouts: 14.8%15%67 strikeouts: 10.7%11%78 strikeouts: 6.8%7%89+ strikeouts: 7.4%7%9+book 5.5
Over 5.5: 40% (red bars) · under: 60%. Chance of each exact strikeout total, from the served distribution.
K%20.9%
BB%10.2%
Whiff%9.7%
Velo89.2
BTB Stuff96
Location98
PitchUsageBTB Stuff 60 · 100 · 140VeloWhiff
Sinker31%8892.26.5%
Fastball26%10092.810.7%
Slider20%9986.513.8%
Changeup15%10285.59.4%
Curveball9%9279.87.6%
Other0%––0.0%
Last 3 startsTrending Up
DatePitchesK%Whiff%Hard-hit%wOBA
Sep 208332%12%23%.205
Sep 148530%14%17%.209
Sep 88320%7%15%.392

Season numbers from the last 90 days of Statcast. BTB Stuff and Location read on a scale where 100 is league average. Recent starts are context; the projection doesn't weight them.

David Peterson CHC · LHPvsBOS lineupstrikeout rate vs his hand

2 of 9 strike out more than the average hitter tonight

Strikeout rate against left-handers over the last 90 days (season rate where the split is missing). Line: tonight's average hitter, 22.5%. Red strikes out more, blue less.

The rest of the gameCHC @ BOS →Both lineups, bullpens, the pitch-mix battles and park air.Isiah Kiner-Falefa: every projection we've made →