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Seth Lonsway

#86 - Relief Pitcher

San Francisco Giants

Bats / Throws Left / Left
Date of Birth 10/7/1998 (27)
Height, Weight 6'0", 206 lb
Hometown St. Mary's, OH

2026 Season Stats

Needs more playing time to qualify
MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 2.1 7.71 3.00 14.3% 0.0%
221st 3
Sv
351st 52.0
IP
346th 4.21
ERA
351st 1.34
WHIP
329th 22.7%
K%
1st 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
91.7 10.0% 27.5% 55.0% 5.0% 5.08 3.09
284th 94.7
FB MPH
264th 12.2%
SwStr%
213th 28.5%
CSW%
41st 51.2%
Str-ICR
208th 4.7%
MTK%
60th 4.94
PLV
92nd 3.56
PLA

Articles

8/30/2026Fantasy Baseball Relief Pitcher Roundup: 8/29Rick Graham

8/30/2026MLB News & Moments: PCA 3HR GameJosh Shaw

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Seth Lonsway Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR% GB% SwStr% CSW% IPR% PLV
2026 SF 2 0 2.1 0-0 0 1 7.71 3.00 1.56 1.19 2.33 3.09 14.3% 0.0% 27.0 0.00 .583 0.0% 57.1% 16.7% 72.7% 10.0% 27.5% 0.25 5.08
RP MLB Percentile 0 0 0 0-85 0 17 1 0 99 99 98 74 6 100 0 99 0 99 3 100 100 23 38 0 80
RP MLB AVG 42 2 52.0 3-3 3 7 4.21 1.34 4.17 4.18 4.25 3.56 22.7% 9.8% 8.3 1.09 .291 17.6% 72.4% 36.8% 44.0% 12.2% 28.5% 0.50 4.94
Career 2 0 2.1 0-0 0 1 7.71 3.00 1.56 1.38 2.41 3.09 14.3% 0.0% 27.0 0.00 .583 0.0% 57.1% 16.7% 72.7% 10.0% 27.5% 0.25 5.08

Seth Lonsway Repertoire

2026 All
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Seth Lonsway Game Log

Seth Lonsway Standard

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Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
2026 SF 2 0 2.1 0-0 0 0 1 40 26 14 14 7 7 0 0 0 2 0 0 0
RP MLB Percentile 0 0 0 0-85 0 0 17 0 0 100 0 100 99 100 50 99 0 100 85 78
RP MLB AVG 42 2 52.0 3-3 0 3 7 884 565 319 227 48 32 9 1 6 52 21 3 2
Career 2 0 2.1 0-0 0 0 1 40 26 14 14 7 7 0 0 0 2 0 0 0

Seth Lonsway Advanced

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Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2026 SF 14.3% 0.0% .500 .500 1.000 .445 .583 .583 .235 .210 .278 .248 85.5 88.6 -4.2 1.56
RP MLB Percentile 6 100 0 9 1 1 0 0 49 99 52 99 85 60 99 99
RP MLB AVG 22.7% 9.8% .241 .389 .712 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 4.17
Career 14.3% 0.0% .500 .500 1.000 .445 .583 .583 .235 .210 .278 .248 85.5 88.6 -4.2 1.56

Seth Lonsway Pitch › Mix

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Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
2026 SF7.5% (91.3)47.5% (91.7)10.0% (87.5)-17.5% (82.5)-17.5% (83.9)-- 55.0% 45.0%
RP MLB Percentile 1 (5) 88 (19) 24 (26) - 47 (50) - 54 (22) - - 67.8% 32.5%
RP MLB AVG 38.7% (94.7) 26.5% (94.1) 19.6% (89.4) 25.9% (86.1) 20.7% (82.3) 15.3% (80.3) 17.8% (86.1) 18.9% (86.6) 42.7% (61.5) 48.7% 51.2%
Career7.5% (91.3)47.5% (91.7)10.0% (87.5)-17.5% (82.5)-17.5% (83.9)-- 55.0% 45.0%

Seth Lonsway Pitch › Results

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Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
2026 SF0.0% (0)31.6% (1)0.0% (0)-42.9% (2)-28.6% (1)-- 27.3% 27.8%
RP MLB Percentile 0 (0) 78 (2) 0 (0) - 97 (86) - 79 (5) - - 43.0% 41.0%
RP MLB AVG 27.2% (32) 27.6% (13) 26.9% (15) 29.7% (28) 28.4% (20) 27.3% (15) 22.4% (21) 22.7% (21) 19.3% (9) 27.9% 28.8%
Career0.0% (0)31.6% (1)0.0% (0)-42.9% (2)-28.6% (1)-- 27.3% 27.8%

Seth Lonsway Batted Ball › Contact

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Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR%
2026 SF 72.7% 18.2% 9.1% 0.0% 18.2% 58.3% 16.7% 25.0% 7.5% 81.8% 18.2% 0.0% 0.0% 16.7%
RP MLB Percentile 100 78 0 0 100 100 0 47 0 100 93 99 99 100
RP MLB AVG 44.0% 21.7% 24.1% 10.2% 34.6% 40.9% 33.7% 25.4% 18.1% 63.0% 24.5% 5.8% 6.8% 36.8%
Career 72.7% 18.2% 9.1% 0.0% 18.2% 58.3% 16.7% 25.0% 7.5% 81.8% 18.2% 0.0% 0.0% 16.7%

Seth Lonsway Batted Ball › Outcomes

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Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR% IPA%
2026 SF .500 .445 .583 .583 .235 .210 .278 .248 85.5 88.6 -4.2 0.0% 16.7% 14.3%
RP MLB Percentile 0 1 0 0 49 99 52 99 85 60 99 99 100 99
RP MLB AVG .241 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 17.6% 36.8% 24.4%
Career .500 .445 .583 .583 .235 .210 .278 .248 85.5 88.6 -4.2 0.0% 16.7% 14.3%

Seth Lonsway Approach › Plate Discipline

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Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR% Str-ICR
2026 SF 55.0% 65.0% 47.5% 16.7% 21.1% 7.5% 78.9% 75.0% 100.0% 17.5% 10.0% 27.5% 30.0% 47.5% 0.25 55.0%
RP MLB Percentile 100 65 50 0 21 0 21 97 0 69 23 38 100 0 0 88
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.6% 18.1% 74.4% 83.9% 58.5% 16.4% 12.2% 28.5% 17.1% 58.3% 0.50 51.2%
Career 55.0% 65.0% 47.5% 16.7% 21.1% 7.5% 78.9% 75.0% 100.0% 17.5% 10.0% 27.5% 30.0% 47.5% 0.25 55.0%

Seth Lonsway Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2026 SF 55.0% 27.5% 30.0% 42.5% 25.0% 40.0% 35.0% 35.0% 35.0% 12.5%
RP MLB Percentile 100 11 15 76 7 0 21 87 4 100
RP MLB AVG 44.5% 34.6% 27.0% 38.4% 36.2% 22.9% 40.9% 29.9% 43.1% 6.6%
Career 55.0% 27.5% 30.0% 42.5% 25.0% 40.0% 35.0% 35.0% 35.0% 12.5%

Seth Lonsway Approach › Counts

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Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2026 SF 75.0% 7.5% 17.5% 30.0% 42.9% 21.4% 16.7% 14.3% 28.6%
RP MLB Percentile 100 97 0 100 0 0 6 0 98
RP MLB AVG 58.5% 12.1% 29.9% 14.5% 61.0% 50.1% 21.1% 26.7% 19.3%
Career 75.0% 7.5% 17.5% 30.0% 42.9% 21.4% 16.7% 14.3% 28.6%

Seth Lonsway PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2026 SF 40 5.08 42.5% 22.5% 35.0% 7.5% 5.0% 2.0 +4 3.09
RP MLB Percentile 0 80 16 98 71 71 38 42 27 74
RP MLB AVG 884 4.94 45.9% 17.3% 36.8% 9.1% 4.7% 0.6 0 3.56
Career 40 5.08 42.5% 22.5% 35.0% 7.5% 5.0% 2.0 +4 3.09
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