Arizona’s latest homestand ended on a sour note, but the club remains inside a Wild Card position as it travels to face the Miami Marlins. The Diamondbacks split time holding their own against Los Angeles before being thoroughly outplayed by the Washington Nationals, a team that has shown offensive flashes despite its overall struggles. Even with inconsistent results at home, Arizona’s standing in the wild-card race owes as much to the uneven play of rival clubs as it does to its own recent performances. Heading into Miami, the team faces the prospect of beginning the series tied with the San Diego Padres for the third wild-card spot in the worst-case scenario — a less-than-ideal situation, but not one that eliminates hope of holding ground as the calendar turns toward July. Arizona Diamondbacks infielder takes a ready position at first base during the game as the club looks to bounce back in the series against the Miami Marlins.
Miami arrives in the desert series with a 31-35 record and a profile that differs from the Nationals; the Marlins are not among the elite offensive clubs in baseball, but they enter this meeting on a notable run of recent success. Miami swept Washington and then won two of three from Tampa Bay, illustrating a streaky pattern that has defined much of the club’s season. Their results have swung rapidly: a sweep at the hands of the Mets at one point was followed by a sweep of the Mets just a week earlier. That volatility makes the Marlins an unpredictable opponent, but it also provides Arizona with opportunities to exploit momentum shifts if the Diamondbacks can stabilize their own play. As the series gets underway, Arizona’s coaching staff and lineup will be focused on matching Miami’s recent surge with timely pitching and better consistency at the plate. A Diamondbacks hitter stands in the batter’s box with the crowd behind him as Arizona aims to respond in the Marlins series.
The weekend begins with Zac Gallen taking the mound for Arizona in the series opener, a start that carries heightened scrutiny given his season-to-date numbers and recent results. Gallen’s line entering this matchup shows a 3-5 record and a 5.32 ERA with a 1.52 WHIP and an ERA+ of 78, a profile that signals a downturn from his earlier, more effective work. Across this season, Gallen has more often yielded multiple runs and has not mustered the high strikeout totals that helped define his earlier success. He has shown the capacity to struggle through outings that include four or five runs allowed, and those results have placed added pressure on Arizona’s offense and bullpen to bridge the gap. Opposing Chicago prospect-turned-Marlins starter Max Meyer counters for Miami; Meyer has been one of the National League’s more reliable younger hurlers with a 6-0 record, a 2.81 ERA, a 1.04 WHIP and a 144 ERA+. Meyer has surrendered more than three runs only twice this season and bounced back from a six-run performance in his outing against the Mets by throwing seven innings of one-run, two-hit ball in his most recent start versus Washington. On paper, Meyer affords Miami a clear edge in the opener if the D-backs cannot generate early offense or if Gallen’s struggles continue.
Game two on the schedule pairs Ryne Nelson with Miami’s Ryan Gusto, and the matchup offers a study in contrasts of form and experience. Nelson’s season has unfolded in two distinct stretches: an early period that produced a 7.71 ERA across March and April, followed by a much-improved run that shows a 2.89 ERA over a later block of games and a start in June. Underneath the surface, Nelson’s fielding-independent pitching numbers tell a more complicated story; his FIP has remained north of 5.00 in both the difficult and improved stretches, suggesting that some of the apparent improvement may be influenced by external factors such as defensive support and sequencing. Nelson is striking out fewer batters per nine innings this season — 6.8 SO/9 compared with 7.7 in 2025 and 7.5 in 2024 — while his home run rate has climbed to 1.9 per nine innings after sitting at about 1.0 in the prior two campaigns. Slight upticks in walk rate have also crept in, underscoring why his underlying metrics leave room for skepticism despite the scoreboard-friendly ERA over the most recent month.
Opposite Nelson, Miami’s Ryan Gusto has been pressed into starting work after being recalled from Triple-A, and the early returns have been rocky. Gusto has made a pair of opening starts and in both instances lasted roughly two innings while permitting three runs apiece. Those short outings have forced Miami to shuffle in long-relief help and have given opponents clearer opportunities to attack a starter while he is still settling into the rotation role. The Marlins have not yet crystalized a long-term plan for who will follow Gusto in those spots, leaving a fair degree of uncertainty in how their rotation will be managed across the series. From Arizona’s perspective, Gusto’s recent results provide a targetable weakness: if the D-backs can apply pressure early and capitalize on his limited length, they can tilt the game in their favor without asking too much from a bullpen that could be taxed if Gallen’s start runs long.
The finale of the set sends Merrill Kelly to the bump for Arizona against Miami’s Tyler Phillips in what shapes up as a critical third-game opportunity to close the trip with a series win. Kelly’s season line shows a 5-4 record with a 5.71 ERA, a 1.49 WHIP and an ERA+ of 73, though the right-hander appeared to settle into a more reliable rhythm during May. After an early blowup — conceding six runs to the Cubs on May 3 — Kelly tightened his results over the remainder of the month, including a complete-game performance against the Rockies that highlighted his capacity to eat innings and stifle scoring. However, his most recent outing provided a jolt of concern: facing Washington, Kelly yielded seven runs across five frames, a reminder that the staff ace remains streaky in his results.
Tyler Phillips, the pitcher Miami used most recently in relief and then stretched into a spot start, has worked largely out of the bullpen this season but has seen his role lengthened in recent appearances. When Phillips closed out one of Gusto’s previous starts, he lasted 4 2/3 innings and allowed three runs on seven hits while issuing three walks. Those numbers reflect a pitcher in the middle of a role transition: capable of providing multiple innings but still showing the kinds of contact and control issues that can lead to run-scoring chances. Based on his recent workload and historical results, a reasonable expectation for Phillips would be an outing that approaches five innings with two or three runs allowed — the sort of line that puts the game firmly in reach for either bullpen contingent depending on how each club’s offense shows up.
Projecting the series outcome, Arizona’s best path to a sweep or even a clean two-game split will depend on two main factors: the club’s ability to generate offense early enough to support shaky starting performances, and the bullpen’s capacity to hold leads once runs have been surrendered. The Gallen start in the opener represents a significant challenge given his season-long trends; the team will likely need contributions from its lineup and relief corps to avoid an early deficit. Nelson’s second start is more of a coin flip between sustainable improvement and a regression to the mean, with his underlying FIP suggesting the latter is possible if luck evens out. Kelly’s final start offers the most favorable matchup on paper against a reliever-turned-starter, but his recent seven-run outing is a cautionary note. Taken as a whole, Arizona projects to be competitive in Miami and to have a realistic shot at winning the series, though the margin for error remains slim and several of the projected advantages hinge on whether the Diamondbacks’ offense can consistently score against a rotation that includes Max Meyer and a mix of young, hungry arms from the Marlins bullpen and rotation.
No roster moves or lineup announcements beyond the scheduled starters were available at publication, and both clubs will finalize their game-day lineups ahead of first pitch. The three-game set will provide Arizona an immediate chance to halt the skid from its recent homestand and to either solidify or reclaim more comfortable positioning in the National League wild-card race as teams jockey for late-spring footing.