Diamondbacks vs. Guardians Win Probability: Who Will Win Today’s MLB Game? (August 1)

The Arizona Diamondbacks vs. Cleveland Guardians win probability continues their interleague series Saturday with Kohl Drake taking the mound for Arizona against Parker Messick for Cleveland. Both clubs are chasing critical late-season wins, making every game increasingly important as the playoff race tightens. The prediction market apps currently give the Guardians a 62% chance to win, while the Diamondbacks sit at 38%, highlighting one of the more notable probability gaps on today's MLB slate. Can Cleveland capitalize on its pitching edge, or will Arizona outperform the market and steal a valuable road victory?

🏆 Who will win Diamondbacks vs. Guardians? Live MLB win probability

Prediction market action has been steady for Diamondbacks vs. Guardians, with more than $221,000 traded across the available markets ahead of first pitch. Cleveland currently holds a 62% win probability, while Arizona sits at 38% after the market opened much closer to even before money gradually backed the Guardians. That movement aligns with the pitching matchup, as Parker Messick has been viewed as a clear edge over rookie Kohl Drake. The current win expectancy reflects confidence in Cleveland's advantage on the mound while still leaving room for Arizona to pull off an upset if its offense breaks through.

My prediction: Guardians (62%) win. The Guardians have the edge thanks to Parker Messick's ability to limit hard contact and keep opposing hitters off balance, giving Cleveland a favorable pitching matchup from the outset. If their lineup continues to manufacture runs and capitalize on scoring opportunities, the Guardians have a strong chance to justify their status as the betting favorite.

💣 Who will hit a home run in Diamondbacks vs. Guardians?

The home run market features several dangerous hitters capable of changing the game with one swing, led by Jose Ramirez, who owns the highest probability at 17%. Arizona counters with Corbin Carroll and Ketel Marte, each carrying a 15% chance to go deep, making them the Diamondbacks' top power threats. Meanwhile, Steven Kwan checks in at 4%, reflecting his contact-first approach rather than home run upside. With multiple stars possessing legitimate long-ball potential, bettors should expect plenty of action in the home run market before first pitch and throughout the game.

My prediction: Jose Ramirez (17%) to hit a home run. Jose Ramirez has the power and bat speed to capitalize on any mistake over the plate, making him Cleveland's most dangerous home run threat in this matchup. If he gets a favorable count against Kohl Drake, Ramírez has an excellent chance to leave the yard and provide an early spark for the Guardians' offense.

⚾ Will there be a run in the first inning of Diamondbacks vs. Guardians?

The NRFI/YRFI market projects a competitive start, with the NRFI carrying a 50% probability compared to 50% for YRFI. That outlook reflects the expected pitching duel between Parker Messick and Kohl Drake, two starters capable of settling in early and limiting damage through the first inning. However, dangerous top-of-the-order bats like José Ramírez, Corbin Carroll, and Ketel Marte always give the YRFI market upset potential. Bettors should expect this market to remain active until first pitch as lineup confirmations and late betting action shape the final first-inning probabilities.

My prediction: No run in the first inning (50%). Both starting pitchers have the tools to navigate the top of the lineup the first time through, making a scoreless opening inning the most likely outcome. With the market favoring the NRFI, we're backing both starters to set the tone early and keep the game scoreless through the first inning.

📊 Diamondbacks vs. Guardians win expectancy

Win expectancy based on Kalshi percentages at time of publish.

📺 How to watch Diamondbacks vs. Guardians

• Date: Saturday, August 1
• First pitch: 7:15 p.m. ET
• Ballpark: Progressive Field (Cleveland, OH)
• TV: MLB.TV
• Streaming: MLB.TV
• Diamondbacks starter: Kohl Drake (5-5, 5.00 ERA)
• Guardians starter: Parker Messick (8-6, 2.59 ERA)