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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 6'2", 210 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 2.0 9.00 2.50 18.2% 0.0%
217th 3
Sv
352nd 45.0
IP
346th 4.21
ERA
351st 1.34
WHIP
266th 22.6%
K%
1st 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
91.6 9.1% 30.3% 54.5% 6.1% 5.07 3.02
284th 94.6
FB MPH
312th 12.2%
SwStr%
88th 28.5%
CSW%
55th 51.1%
Str-ICR
284th 4.7%
MTK%
71st 4.94
PLV
83rd 3.52
PLA

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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 1 0 2.0 0-0 0 0 9.00 2.50 1.62 1.08 2.27 3.02 18.2% 0.0% 22.5 0.00 .556 0.0% 40.0% 22.2% 77.8% 9.1% 30.3% 0.39 5.07
RP MLB Percentile 0 0 0 0-83 0 0 1 0 99 99 98 76 23 100 0 98 0 98 0 99 100 11 74 14 77
RP MLB AVG 36 2 45.0 3-2 3 6 4.21 1.34 4.19 4.21 4.26 3.52 22.6% 9.8% 8.3 1.12 .289 17.5% 72.7% 37.0% 43.6% 12.2% 28.5% 0.50 4.94
Career 1 0 2.0 0-0 0 0 9.00 2.50 1.62 1.08 2.27 3.02 18.2% 0.0% 22.5 0.00 .556 0.0% 40.0% 22.2% 77.8% 9.1% 30.3% 0.39 5.07

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 1 0 2.0 0-0 0 0 0 33 22 11 11 5 5 0 0 0 2 0 0 0
RP MLB Percentile 0 0 0 0-83 0 0 0 0 0 100 0 100 99 99 45 98 0 100 81 74
RP MLB AVG 36 2 45.0 3-2 0 3 6 759 485 274 195 41 27 8 1 5 44 18 2 2
Career 1 0 2.0 0-0 0 0 0 33 22 11 11 5 5 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 18.2% 0.0% .455 .455 .910 .405 .556 .556 .223 .199 .272 .243 87.2 88.6 -6.1 1.62
RP MLB Percentile 23 100 0 22 6 5 0 0 63 99 60 99 60 57 100 99
RP MLB AVG 22.6% 9.8% .240 .389 .711 .314 .289 .319 .235 .315 .280 .359 87.7 89.2 13.3 4.19
Career 18.2% 0.0% .455 .455 .910 .405 .556 .556 .223 .199 .272 .243 87.2 88.6 -6.1 1.62

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 SF12.1% (91.0)45.5% (91.6)6.1% (87.6)15.2% (82.6)--21.2% (83.9)-- 57.6% 42.4%
RP MLB Percentile 4 (5) 87 (19) 11 (27) 24 (9) - - 70 (21) - - 75.6% 24.4%
RP MLB AVG 38.5% (94.6) 26.4% (94.0) 20.1% (89.5) 25.5% (85.9) 21.3% (82.4) 15.7% (80.2) 16.9% (86.1) 17.9% (86.6) 38.1% (65.2) 48.4% 51.4%
Career12.1% (91.0)45.5% (91.6)6.1% (87.6)15.2% (82.6)--21.2% (83.9)-- 57.6% 42.4%

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)40.0% (1)0.0% (0)40.0% (1)--28.6% (1)-- 31.6% 28.6%
RP MLB Percentile 0 (0) 96 (5) 0 (0) 91 (3) - - 79 (77) - - 85.2% 48.0%
RP MLB AVG 26.9% (27) 27.3% (11) 26.3% (13) 29.8% (23) 28.4% (17) 27.2% (12) 21.4% (16) 23.0% (18) 22.2% (7) 27.8% 28.8%
Career0.0% (0)40.0% (1)0.0% (0)40.0% (1)--28.6% (1)-- 31.6% 28.6%

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 77.8% 11.1% 11.1% 0.0% 11.1% 77.8% 11.1% 11.1% 9.1% 77.8% 22.2% 0.0% 0.0% 22.2%
RP MLB Percentile 100 99 1 0 100 100 0 1 0 99 70 98 99 99
RP MLB AVG 43.6% 21.6% 24.6% 10.3% 34.7% 40.9% 33.7% 25.4% 18.2% 62.8% 24.5% 5.8% 6.9% 37.0%
Career 77.8% 11.1% 11.1% 0.0% 11.1% 77.8% 11.1% 11.1% 9.1% 77.8% 22.2% 0.0% 0.0% 22.2%

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 .455 .405 .556 .556 .223 .199 .272 .243 87.2 88.6 -6.1 0.0% 22.2% 18.2%
RP MLB Percentile 0 5 0 0 63 99 60 99 60 57 100 98 99 93
RP MLB AVG .240 .314 .289 .319 .235 .315 .280 .359 87.7 89.2 13.3 17.5% 37.0% 24.6%
Career .455 .405 .556 .556 .223 .199 .272 .243 87.2 88.6 -6.1 0.0% 22.2% 18.2%

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 54.5% 66.7% 45.5% 20.0% 20.0% 9.1% 80.0% 75.0% 100.0% 21.2% 9.1% 30.3% 27.3% 51.5% 0.39 54.5%
RP MLB Percentile 99 83 28 0 15 0 15 95 0 98 11 74 100 1 14 84
RP MLB AVG 44.4% 63.8% 47.4% 31.8% 25.6% 18.2% 74.4% 83.9% 58.5% 16.3% 12.2% 28.5% 17.1% 58.4% 0.50 51.1%
Career 54.5% 66.7% 45.5% 20.0% 20.0% 9.1% 80.0% 75.0% 100.0% 21.2% 9.1% 30.3% 27.3% 51.5% 0.39 54.5%

Seth Lonsway Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2026 SF 54.5% 30.3% 27.3% 42.4% 21.2% 42.4% 36.4% 33.3% 39.4% 12.1%
RP MLB Percentile 99 23 47 76 2 0 26 80 20 100
RP MLB AVG 44.4% 34.5% 27.0% 38.5% 36.4% 22.9% 40.7% 29.8% 43.1% 6.6%
Career 54.5% 30.3% 27.3% 42.4% 21.2% 42.4% 36.4% 33.3% 39.4% 12.1%

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 69.7% 9.1% 21.2% 26.1% 54.5% 27.3% 21.7% 14.3% 28.6%
RP MLB Percentile 100 92 0 100 10 0 57 0 98
RP MLB AVG 58.5% 12.1% 30.0% 14.4% 60.9% 50.1% 21.1% 26.9% 19.2%
Career 69.7% 9.1% 21.2% 26.1% 54.5% 27.3% 21.7% 14.3% 28.6%

Seth Lonsway PLV

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Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2026 SF 33 5.07 42.4% 24.2% 33.3% 9.1% 6.1% 1.1 +3 3.02
RP MLB Percentile 0 77 14 100 82 82 18 47 34 76
RP MLB AVG 759 4.94 46.0% 17.3% 36.7% 9.3% 4.7% 0.6 0 3.52
Career 33 5.07 42.4% 24.2% 33.3% 9.1% 6.1% 1.1 +3 3.02
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