Stephen Kolek

Stephen Kolek is one of the purest specialists in the database. Of +0.9 career roto value, +0.6 came from WHIP alone. 2025 was the high-water mark, worth +3.1, 143rd that season and 8917th of 51,303 player-seasons on record. Career value accumulated in WHIP (+0.6) and strikeouts (+0.2), and drained away in saves (-0.9).