[Sep 17, 2026 (Thu)] MLB Analysis Marlins @ Diamondbacks Preview - BeaverStats

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Quick preview of Marlins @ Diamondbacks (Sep 17, 2026 (Thu)).

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09/17 Miami vs Arizona

Miami starting pitcher: Ryan Gusto Arizona starting pitcher: Merrill Kelly

Neither starter's season line is impressive, but the head-to-head history diverges sharply. Gusto's last five starts have been rocky (5.06 xFIP), yet his career track record against Arizona specifically has been outstanding — a 2.36 xFIP with an 18.8% K-BB% in his prior outing against them. Kelly, meanwhile, has been steadily below average all season (4.89 xFIP), and his lone start against Miami was actually worse than that (5.11 xFIP). On matchup history alone, this tilts toward Miami.

The bullpens clearly favor Arizona (2.61 ERA over the last 10 games vs. Miami's 3.78). Offensively, Miami holds a slim team-wide edge (114.8 wRC+ vs. 111.8), though it's not a big gap, and both lineups have been swinging well lately (.353 team wOBA for Miami, .381 for Arizona — Nolan Arenado in particular is red-hot at .553 over his last five games). Rain is forecast at 54% today at Chase Field, but with its retractable roof that shouldn't meaningfully affect play.

Miami leads the season series 4-1. In summary, the two teams look evenly matched overall, but the pitcher-specific matchup history — Gusto's success against Arizona and Kelly's struggles against Miami — gives this one a modest lean toward Miami.