The latest product of the Guardians' pitching factory is making his first MLB start today. Here's what to know about him.

Pregame analysis and predictions of the Cleveland Guardians vs. Arizona Diamondbacks MLB game to be played on August 20, 2025 on ESPN.

Preview the Aug. 20 matchup between the Arizona Diamondbacks and Cleveland Guardians with recent trends, how to watch, livestream info, and more.

Diamondbacks starter Brandon Pfaadt gave up four runs in six innings in a loss to the Rockies last week at Coors Field. He looks to rebound at home.

Messick, 24, the club’s No. 12 prospect according to MLB Pipeline, has impressed in Triple-A Columbus this season, posting a 3.47 ERA with 119 strikeouts across 98 2/3 innings in 20 starts.

The Arizona Diamondbacks will hope to avoid a series loss to the Cleveland Guardians Tuesday night at Chase Field. First pitch is 6:40 p.m. MST The D-backs offense was dormant against Gavin Williams and the Cleveland bullpen,

“This is the lefty that haunts their dreams,” Paul Hoynes declared bluntly on the latest Cleveland Baseball Talk Podcast. “No matter what team he pitches for, no matter what team he plays for, he always seems to face the Guardians and he always seems to come out one step ahead of them.”