St. Louis Cardinals vs Kansas City Royals

St. Louis Cardinals at Kansas City Royals (2026-06-21). Dustin May vs Stephen Kolek at Kauffman Stadium.

Dustin May enters this contest with a 3.75 ERA and 1.14 WHIP across 81.2 innings this season, demonstrating a solid ability to limit baserunners. His K/9 of 8.27 indicates a decent strikeout rate, while his BB/9 of 2.31 suggests reasonable control. However, May's recent trend shows an upward movement in ERA, and his last five starts include two outings with 6 or more earned runs allowed, contributing to a 33.3% blow-up rate. Conversely, Stephen Kolek boasts a more impressive season ERA of 2.68 and a WHIP of 1.03 over 50.1 innings, with a lower K/9 of 6.08 but an excellent BB/9 of 1.79. Kolek has maintained a 0% blow-up rate this season and has recorded quality starts in 66.7% of his appearances, despite his ERA trending upwards in recent outings.

The Cardinals' offense has been slightly more productive this season, compiling an OPS of 0.721 and scoring 337 runs, compared to the Royals' 0.712 OPS and 321 runs. Both teams possess similar batting averages at 0.247. On the pitching side, St. Louis holds a slight edge with a team ERA of 4.22 and a WHIP of 1.34, while Kansas City's pitching staff has a 4.48 ERA and 1.38 WHIP. The Cardinals have also allowed fewer home runs with 82 compared to the Royals' 93.

Recent head-to-head matchups between these two clubs have been relatively balanced, with both teams securing wins in their last six meetings from the 2025 season, including some higher-scoring affairs like a 6-5 and a 7-5 game. The total line of 9.0 for this game suggests expectations for a moderately high-scoring contest, which aligns with May's recent struggles and the Cardinals' slightly better offensive output, even though Kolek has generally been effective.