Now, Cleveland’s No. 12 prospect ( according to MLB Pipeline) is set to make his MLB debut today in the series finale vs. the Arizona Diamondbacks at Chase Field. Messick joins the starting rotation in place of Joey Cantillo, who was optioned to Triple-A Columbus on Sunday.

PHOENIZ, Arizona (WKBN) – The Cleveland Guardians are promoting pitcher Parker Messick to the Major League roster. The left-hander will make his Major League debut in Wednesday’s series finale against the Arizona Diamondbacks at 3:40 p.m. ET.

Expert recap and game analysis of the Arizona Diamondbacks vs. Cleveland Guardians MLB game from 20 August 2025 on ESPN (IN).

Cleveland left-hander Parker Messick will make his major league debut in the heat of a playoff race. The Guardians announced they will promote Messick, their second-round pick in the 2022 draft, to start the final game of a three-game set against the Arizona Diamondbacks on Wednesday afternoon in Phoenix.

The Cleveland Guardians' No. 12 prospect, Parker Messick, is set to make his MLB debut against the Arizona Diamondbacks on Wednesday.

The two-run shot in the eighth inning against Texas on Tuesday night merely padded the lead for Kansas City, which went on to a 5-2 victory. It was the fifth straight win for the Royals, who closed to within 2 1/2 games of an AL wild-card berth and are within nine games of the first-place Tigers in the AL Central.

Enright and Erik Sabrowski, a couple of resilient rookies, have rescued the group. The Guardians’ bullpen ranks fourth in the league in ERA and is a driving force behind the club’s midsummer resurgence.

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This has been a season to forget for Guardians outfielder Nolan Jones. But he certainly didn’t deserve to be locked inside the Chase Field pinball machine in right field Tuesday night. The Guardians in the 6-5 loss to Arizona needed to have two right fielders to stop Tuesday night’s outbreak of three triples and Twilight-Zone weird bounces.

The Cleveland Guardians have a handful of decisions to make following this season, and it may mean getting rid of key pieces.

The Guardians have played their best baseball of the season and have been one of the league’s top teams in the immediate aftermath of the 10-game losing streak they suffered before the All-Star break.