Arizona Diamondbacks at St. Louis Cardinals (2026-06-22). Merrill Kelly vs Andre Pallante at Busch Stadium.

Merrill Kelly enters this matchup with a season ERA of 5.81 and a WHIP of 1.51 across 69.2 innings pitched, indicating struggles with both run prevention and baserunners. His strikeout rate stands at 5.43 K/9, which is below average, while his walk rate is 3.62 BB/9, suggesting control issues. Kelly's recent starts show a downward trend in ERA, despite a quality start percentage of 33.3 percent, with his last five outings including an 8-run allowance in 4.1 innings and a 6-run allowance in 4.1 innings, though he did manage a 7-inning, 1-earned-run outing more recently. Conversely, Andre Pallante has posted a more respectable season ERA of 3.76 and a WHIP of 1.20 over 76.2 innings, demonstrating greater effectiveness. His K/9 is higher at 7.28 and his BB/9 is lower at 2.93, indicating better command and swing-and-miss stuff. Pallante's recent ERA trend is also down, and while his quality start percentage is lower at 16.7 percent, his blow-up rate is also lower than Kelly's at 16.7 percent, suggesting more consistent outings.

The Diamondbacks' offense has been somewhat underwhelming, with a team OPS of 0.693, driven by a .239 batting average and 331 runs scored. Their pitching staff holds a 4.30 ERA and a 1.30 WHIP, allowing 93 home runs, which suggests vulnerability to power hitting. The Cardinals' offense, on the other hand, presents a slightly stronger profile with a 0.730 OPS, a .249 batting average, and 349 runs scored, indicating more consistent run production. The Cardinals' pitching staff has a comparable 4.29 ERA and a 1.35 WHIP, with 86 home runs allowed, suggesting a similar level of pitching performance to Arizona.

Recent head-to-head matchups from 2025 show a split series, with both teams securing three wins against each other, though the Diamondbacks won the most recent series in July, scoring more runs in their victories. The total line for this game is set at 8.5, which aligns with the moderate offensive capabilities of both teams and the varying pitching performances, particularly Kelly's higher ERA and Pallante's tendency for shorter starts despite better overall numbers. The historical scoring patterns between these two clubs suggest that a total of 8.5 is a reasonable expectation given the offensive and pitching metrics.