Mason Thompson

P Round Rock Express
Age 29 RHP 6'6" / 241 lbs AAA peak 0.1 · 2027
Overview
AAARP
YearAgeLvl / TeamGGSIPERAFIPK%BB%WARMLE rates
202325MIX2 levels520555.403.6118.5%9.1%0.6K 18.3% · BB 9.2% · FIP 3.63
202527MIX4 levels291278.674.0621.7%14.5%0.2K 18.3% · BB 16.7% · FIP 4.58
202628AAATEX393405.673.2822.6%9.0%—K 19.4% · BB 8.1% · FIP 3.51
2027PROJ29MLBTEX540574.644.6719.5%11.0%-0.1
2028PROJ37% MLB30MLBTEX190204.784.8818.8%11.3%-0.1
2029PROJ55% MLB31MLBTEX260274.985.1118.1%11.7%-0.2
Last 3 seasons WAR 0.8  ·  Next 3 projected WAR -0.3Projected rows: MLB playing time only, park and league context applied.
Contract
No contract data on file.
Skills · percentileStatcast 2025
FB Velo54
Whiff%24
K%23
xwOBA vs10
CompsDustin Molleken (age 30) · Gregory Infante (age 29) · Jim Miller (age 30)
2027 FULL-SEASON PROJECTIONrates below = full-season projection
showingPROJ
wRC+ AGAINSTvL 122114vR 106
ERA4.64
FIP4.67
K%19.5%
BB%11.0%
K-BB%8.5%
Proj IP57
Value2027 · WAR
Runs saved vs league avg · 57 IP
K: -1.1 runs (Runs saved by strikeouts vs lg-avg K%)-1KBB: -1.4 runs (Runs saved by walk suppression vs lg-avg BB%)-1BBCONTACT: -0.6 runs (Runs saved on contact quality (HR suppression) vs lg)-1CONTACTSTAM: +2.3 runs (Replacement credit for innings volume)+2STAMTotal WAR: -0.08 (57 IP)-0.1WAR
-0.1-0.1-0.2272829
Grades · Statcast · Arsenal · Contract
Scouting Grades
STUF4545
CTRL4040
CMD3535
K†4545
Statcast Percentiles
FB Velo
p5494.8
Whiff%
p2421.6%
K%
p2318.3%
xwOBA vs
p100.370
SI (41%)
CU (5%)
CH (3%)
SL-1.2 (33%)
FB-2.7 (59%)

Contract

No contract data on file. Pre-MLB players and minor-league free agents do not yet have salary projections — entries are added at first 40-man roster placement.

Career Stats + Projections

Real MLB stats plus park-adjusted projections — this season (so far / rest / full), then future seasons and career totals.
basis chips: RAW = as recorded · CTX = with park/league context · A+C = actual + context combined · MLE = level/park-neutral
Methodology▸ how WAR & MLE are computed

Stats are park-neutral MLB equivalents. The "TEAM" column shows current org affiliation only — we do NOT project at that team's park.
Rates (K%, BB%, HR-BF) are park-stripped; MiLB stat lines are translated to their MLB-equivalent via per-level MLE factors.
WAR is computed from projected runs prevented vs a replacement pitcher (the marginal arm a team would call up if this pitcher were unavailable) — calibrated to industry-standard fWAR.

YearAge LvlTeam GGSIPBF KBBHR GS%IP/G K%BB%K-BB%HR% ERAFIP WAR
▸ Career — actual stats, one row per year (as recorded, no adjustments)
▸ Career — adjusted (each season translated to a park/league-neutral MLB-equivalent line; levels combined per year)
▸ Model inputs — neutral MLE (past 3 seasons + 2027 so far)
201618ROK MLEAZL Padres5512501250100%2.416.3%12.5%3.8%0.0%2.253.31—
201618ROK RAWAZL Padres5512501250100%2.424.0%10.0%14.0%0.0%2.252.35—
201719A MLEFort Wayne TinCaps772711528122100%3.918.0%12.3%5.7%2.2%4.674.32—
201719A RAWFort Wayne TinCaps772711528122100%3.924.3%10.4%13.9%1.7%4.673.32—
201820A MLEFort Wayne TinCaps2220934259737891%4.216.9%10.3%6.6%2.1%4.944.12—
201820A RAWFort Wayne TinCaps2220934259737891%4.222.8%8.7%14.1%1.9%4.943.33—
201921MIX MLE2 levels108271322522480%2.715.5%20.0%-4.5%3.8%7.246.43—
201921MIX RAW2 levels108271322522480%2.718.9%16.7%2.3%3.0%7.245.59—
202123MIX MLE2 levels54051231472280%1.019.1%9.7%9.4%3.4%4.914.57-0.0
202123MIX RAW2 levels54051231472280%1.020.3%9.5%10.8%3.5%4.914.58-0.0
202224MIX MLE3 levels384431804113211%1.118.9%7.9%11.0%1.2%3.163.15+0.7
202224MIX RAW3 levels384431804113211%1.122.8%7.2%15.6%1.1%3.162.70+0.9
202325MIX MLE2 levels52055243452240%1.118.3%9.2%9.2%1.7%5.403.63+0.6
202325MIX RAW2 levels52055243452240%1.118.5%9.1%9.5%1.6%5.403.61+0.6
202527MIX MLE4 levels29127138302023%0.918.3%16.7%1.7%1.7%8.674.58-0.0
202527MIX MLE4 levels29127138302023%0.918.3%16.7%1.7%1.7%8.674.58-0.0
202527MIX RAW4 levels29127138302023%0.921.7%14.5%7.2%1.4%8.674.06+0.2
202628AAA MLERound Rock Express39340177401638%1.019.4%8.1%11.3%1.9%5.673.51—
202628AAA MLERound Rock Express39340177401638%1.019.4%8.1%11.3%1.9%5.673.51—
202628AAA RAWRound Rock Express39340177401638%1.022.6%9.0%13.6%1.7%5.673.28—
▸ Career totals (raw MLB only — as recorded)
MLB Career—12001145229355110%1.017.8%10.5%7.3%2.1%5.214.17+0.5
▸ 2027 season — projected remainder (no 2027 stats recorded)
202729MLBTEX54057241472660%1.119.5%11.0%8.5%2.6%4.644.67-0.1
▸ Career projection (2028+) — MLB context, MLB playing time (IP × MLB%)
202830MLB MLETEX51053225422560%1.018.8%11.3%7.5%2.8%4.784.88-0.2
202931MLB MLETEX47050210382460%1.118.1%11.7%6.4%3.1%4.985.11-0.3
202830MLB CTXTEX1902084161020%1.118.8%11.3%7.5%2.8%4.784.88-0.1
202931MLB CTXTEX26027114211330%1.018.1%11.7%6.4%3.1%4.985.11-0.2
▸ Career totals — MLB only (actual + projected)
Career— RAW165016172113078170%1.018.0%10.8%7.2%2.3%5.124.24+0.6
/ 200 IP— RAW205020089516197210%1.018.0%10.8%7.2%2.3%5.124.24+0.7
Career— MLE2564837516913041873619%1.517.9%11.0%6.9%2.1%5.214.15-0.0
/ 200 IP— MLE137262009021621001919%1.517.9%11.0%6.9%2.1%5.214.15-0.0

Career Comps

Completed MLB careers (no pro action in 2+ yrs) whose totals — actual + projected — most resemble this player's. Pool: 1,474 reliever careers (754 from 1990-2025 + 720 historical, 1901-2023), also matched on career-to-date at the same age. * Historical (Lahman) careers: rates era-adjusted to 2001-24 league levels; WAR is an OGILVIE proxy.

Player162sIP/yrK%BB%HR/9ERA
OGILVIE CAREER PROJECTION1.44618.4%11.2%0.974.97
Tyler Yates ('09)1.26219.7%12.0%0.945.12
Gene Harris ('89-'95, -1 WAR*)1.24020.0%*12.5%*0.98*4.96*
Jesus Colome ('10)2.15317.3%11.7%1.034.69
Chris Resop ('13)1.26118.6%10.3%0.854.62
Mike Munoz ('89-'00, 1 WAR*)1.84617.6%*10.2%*0.93*4.46*
Bob Allen ('61-'67, -1 WAR*)1.45521.4%*10.4%*0.89*4.79*