HOME PLATE UMPIRE
Derek Thomas
Slightly tight zone
40% NRFI
5 games tracked
Career Averages
0.903
Zone Factor
18.6
K / Game
10.4
BB / Game
40%
NRFI Rate
Betting Implications
Tight zone (0.903x) forces pitchers into the heart of the plate. Walk and hit props get a boost.
K factor of 1.110 means games called by Derek Thomas produce 11% more strikeouts than league average. Consider bumping K over confidence.
Low NRFI rate (40%). First innings tend to be scoring-heavy. Lean YRFI or fade NRFI plays.
Season Breakdown
| Season | Games | Zone | K/G | BB/G | NRFI% | K Factor |
|---|---|---|---|---|---|---|
| 2026 | 5 | 0.903 | 18.6 | 10.4 | 40% | 1.110 |
Factor Definitions
Zone Size Factor: Strike zone width relative to league average (1.000). Higher = wider zone, favoring pitchers.
K Factor: Strikeout rate in this umpire's games vs league average. Higher = more Ks.
BB Factor: Walk rate adjustment. Higher = fewer walks (wider zone suppresses walks).
NRFI Rate: % of games with no runs in the first inning. League average is roughly 55%.