Washington Nationals vs Arizona Diamondbacks Prediction, Odds and Picks for Friday, 05/30/25

The Washington Nationals (26-30) open a 3-game series against the Arizona Diamondbacks (27-29) tonight at Chase Field. Jake Irvin takes the mound for Washington, while Merrill Kelly gets the start for Arizona. Irvin has been a standout in the Nationals’ rotation, posting a 2.45 ERA and a 1.05 WHIP over 4 starts in May. In his most recent outing he delivered 8.0 scoreless innings against the Giants, allowing just 3 hits and striking out 7. The Nats’ bats have been hot, as well. They unexpectedly took 2 out of 3 against Seattle, winning 9-3 and 9-0 the past 2 days. 

Kelly has been Arizona’s most consistent starter this season, with a 5-2 record, 3.52 ERA and a 1.02 WHIP. He recently pitched 7.0 scoreless innings against the Rockies, striking out 11 and allowing only one hit. Offensively, Arizona owns the edge — averaging 5.5 runs per game compared to the Nationals’ 4.1. However, Washington has been competitive recently — winning 6 of the last 7 games. Given Irvin’s recent form and the Nationals’ improved play, they are well-positioned to keep this game close. Taking the Nationals at +1.5 offers value, especially against a Diamondbacks team with pitching concerns.

Nationals vs Diamondbacks prediction: Washington +1.5 (-110) available at time of publishing. Playable to -120.

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