Guardians prospect Parker Messick shined in his MLB debut on the mound, but the Cleveland bullpen let him down in an extra-inning loss.

Cleveland Guardians newly promoted left-handed starter, Parker Messick had an outstanding debut against the Arizona Diamondbacks.

Parker Messick can finally say that he’s a big-league pitcher! The 24-year-old made his Cleveland Guardians and MLB debut on Wednesday afternoon against the Arizona Diamondbacks.

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.

CLEVELAND, Ohio (WOIO) - Guardians rookie Parker Messick went 6.2 innings in his MLB debut Wednesday, allowing just 1 run to the Arizona Diamondbacks in Phoenix. Arizona won the series finale 3-2 in 10 innings. Cleveland pitcher Parker Messick gets a standing ovation in Arizona after a dominant outing in his first game 👀 pic.twitter.com/YtlO2JNacu

The Cleveland Guardians might have little to play for in 2025, but rookie starting pitcher Parker Messick's first major league start offered a promising glimpse into their future.

The Guardians had options, but Stephen Vogt revealed that the team is going with their 12th-ranked prospect, Parker Messick, to start Wednesday’s game. There’s a lot to like about what the 24-year-old can offer to Cleveland’s pitching staff.

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CLEVELAND, Ohio (WOIO) - Leigh Steinberg, an NFL agent for more than 40 years, told 19 News it’s “absolutely” possible that Guardians pitchers Emmanuel Clase and Luis Ortiz, on leave for potential gambling, will never pitch again in the majors.