Arizona hosts San Francisco at Chase Field on Wednesday, May 20, 2026 at 3:40 p.m. ET. Merrill Kelly is the probable starter for the Diamondbacks, making his seventh start of the season. He is 3-3 with a 5.91 ERA and 23 strikeouts in 35 2/3 innings. Kelly last pitched against the Rockies, throwing nine innings and allowing one earned run on four hits. He is averaging 5.8 innings per outing and is seeking a third straight quality start. Tyler Mahle is the probable starter for the Giants in his 10th start. He is 1-5 with a 5.59 ERA, a 2.29 strikeout-to-walk ratio, and a 1.564 WHIP. Mahle last pitched against the Athletics, allowing five earned runs on 10 hits in five innings.
"Kelly gets the start for the Diamondbacks, his seventh of the season. He is 3-3 with a 5.91 ERA and 23 strikeouts in 35 2/3 innings pitched. The righty last appeared on Saturday against the Colorado Rockies, when he threw nine innings, allowing one earned run while giving up four hits. The 37-year-old has amassed an ERA of 5.91, with 5.9 strikeouts per nine innings, in six games this season. Opponents are batting .267 against him."
"Kelly is aiming for his third straight quality start. Kelly will try to continue a three-game streak of pitching five or more innings (he's averaging 5.8 innings per outing). He has not had an outing yet in which he did not surrender at least one earned run."
"The Giants will hand the ball to Mahle (1-5) for his 10th start of the season. The right-hander last pitched on Saturday, when he gave up five earned runs and allowed 10 hits in five innings against the Athletics. The 31-year-old has pitched in nine games this season with an ERA of 5.59, a 2.29 strikeout-to-walk ratio and a WHIP of 1.564. In nine starts this season, he's earned a quality start in one of them."
"Mahle has pitched five or more innings in five straight games and will look to extend that streak. He has made nine appearances and finished three of them without allowing an earned run."
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