The St. Louis Cardinals head to Phoenix for a 4:10 p.m. ET first pitch Saturday, July 18, at Chase Field, where Dustin May gets the ball against Arizona Diamondbacks right-hander Brandon Pfaadt. With the second half of the 2026 season firmly underway, this road matchup carries real weight — every game matters in a competitive National League landscape, and the Cardinals need wins away from Busch Stadium to stay relevant in the standings.

Probable Pitchers: Dustin May vs. Brandon Pfaadt

Dustin May gets the start for St. Louis. The hard-throwing right-hander has dealt with injury setbacks throughout his career, and every outing he delivers is an opportunity to establish himself as a dependable piece of this rotation. How he handles Arizona's lineup top-to-bottom will be the defining storyline of the afternoon for Cardinals fans.

Pfaadt gets the call for the Diamondbacks. The 25-year-old right-hander has shown flashes of being a genuine back-end-to-middle-of-the-rotation arm in Arizona's system and beyond. He will look to keep St. Louis hitters off-balance in a home environment that can play unpredictably in the summer Arizona heat.

Arizona Lineup to Watch

The Diamondbacks are sending out a lineup that demands respect. Ketel Marte leads off at second base — a legitimate on-base threat who can set the table immediately. Geraldo Perdomo bats second at shortstop, followed by Corbin Carroll in right field, who has the kind of tools that force pitchers to work carefully. Gabriel Moreno hits cleanup as the DH, with Max Kepler protecting him in the five spot.

Then comes a name Cardinals fans know well: Nolan Arenado slots in at third base hitting sixth for Arizona. Arenado's presence in this lineup is a reminder of how dramatically roster landscapes can shift. Tim Tawa at first, James McCann behind the plate, and Ryan Waldschmidt in center round out the order.

Keys to Watch for the Cardinals

• May's command early: Marte and Carroll at the top of Arizona's order are capable of doing damage if May falls behind in counts. Establishing the strike zone in the first two innings is critical.
• Handling Arenado: It will not be lost on Cardinals fans that Arenado is in the opposing dugout. Whether St. Louis's bullpen or May himself faces him in key moments, executing a sound approach against a hitter of his caliber is non-negotiable.
• Road discipline at the plate: Chase Field can be a tough environment. The Cardinals' offense needs to stay patient against Pfaadt, who can generate soft contact when hitters swing early.
• Bullpen management: If May does not go deep into the game, St. Louis's relief corps will need to be sharp against a lineup with no easy outs.

Prediction

This one shapes up as a pitcher's duel with real intrigue. Pfaadt is a capable starter at home, but if Dustin May is on with his stuff, the Cardinals have enough in the lineup to manufacture a win. Give St. Louis the edge in a close one, 4-2, if May can navigate the top of that Arizona order and keep the ball in the park. Cardinals fans can catch the game on KMOX 1120 AM or Cardinals.TV Presented by bet365.