Brewers vs. Diamondbacks Win Probability: Who Will Win Today’s MLB Game? (July 3)

Our Brewers vs. Diamondbacks win probability market paints Milwaukee as the slight favorite, with win probability hovering around 58% compared to Arizona’s 42%. Kyle Harrison gets the ball for the Brewers against rookie José Cabrera, creating one of the sharper pitching edges on Friday’s slate. Milwaukee is chasing NL Central separation, while Arizona is fighting to stay alive in the Wild Card race. The biggest market gap? Harrison’s dominance versus Cabrera’s inexperience - and that’s driving the board on the prediction market apps.

➡️ Follow all of our MLB analysis and expert predictions for the 2026 season.

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

Milwaukee opened at 61% on Kalshi and has been bet up into the 59% range, with roughly $38K in trading volume flowing into the market as bettors back Kyle Harrison’s edge. Harrison enters 8-1 with a 2.57 ERA, and Milwaukee’s 53-32 record makes this a key game in widening its NL Central lead. That upward move tracks with both the pitching mismatch and Milwaukee’s deeper bullpen.

Arizona opened near 44% and has slipped into the 42% range behind rookie José Cabrera, who has limited MLB innings despite decent early numbers. The Diamondbacks are hanging around the Wild Card race, but the market clearly sees Milwaukee’s consistency as the separator.

My prediction: Brewers win (59%). Milwaukee has the clear edge on the mound with Kyle Harrison, whose consistency and swing-and-miss stuff give the Brewers a strong advantage over Arizona’s inexperienced rookie starter. Add in Milwaukee’s deeper bullpen and hotter lineup, and it’s easy to see why the market continues backing the Brewers.

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

Kalshi’s home run market for Brewers vs. Diamondbacks is shaping up as one of the more active player prop boards on Friday, with over $22K in early trading volume tied to whether both teams combine for multiple long balls. Milwaukee’s lineup has the slight power edge, but both clubs rank near the bottom of the league in home runs, making this a more volatile market than usual. With Kyle Harrison limiting hard contact and José Cabrera still unproven, the market leans toward a lower homer output despite Chase Field’s hitter-friendly backdrop.

Corbin Carroll (14%) and Ketel Marte (22%), both of the Diamondbacks are the leading targets in the home run market. Both are appealing options, but one sticks out more than the other.

My prediction: Ketel Marte (22%) to hit a home run. Ketel Marte has been one of Arizona’s hottest bats, homering in five of his last seven games and already clearing the fences 17 times this season, making him the most likely long-ball threat in this matchup. With rookie José Cabrera drawing attention on the other side, Marte should get favorable spots against Milwaukee’s bullpen later, and his power profile at Chase Field makes him a strong home run candidate tonight.

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

Kalshi’s NRFI/YRFI market for Brewers vs. Diamondbacks is pricing evenly for both 50% NRFI to 50% YRFI, with Milwaukee ticking up a few points from an opening as a big favorite. NRFI money has followed Kyle Harrison’s strong 86% first-inning scoreless rate over 14 starts. Jose Cabrera sits closer to a neutral sample with limited MLB exposure, which keeps Arizona’s side from shifting the market more aggressively. Milwaukee’s 32% first-inning scoring rate and Arizona’s 29% keep both offenses middle tier, so the price is more pitcher-driven than lineup-driven. The edge still leans NRFI.

My prediction: No run in the first inning (50%). We’re backing NRFI because Kyle Harrison has been dominant in the opening frame this season, consistently attacking hitters early and limiting hard contact before lineups settle in. With José Cabrera still relatively unknown but facing a Milwaukee lineup that has been average in first-inning production, the market points to a quiet start.

📊 Brewers vs. Diamondbacks win expectancy

Win expectancy based on Kalshi percentages at time of publish.

📺 How to watch Brewers vs. Diamondbacks

• Date: Friday, July 3
• First pitch: 9:45 p.m. ET
• Ballpark: Chase Field (Phoenix, AZ)
• TV: MLB.TV
• Streaming: MLB.TV
• Brewers starter: Kyle Harrison (8-1, 2.57 ERA)
• Diamondbacks starter: Jose Cabrera (0-1, 3.60 ERA)