Colorado Rockies vs. Miami Marlins game discussion: Sandy Alcantara vs. Sean Sullivan

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DENVER, CO - JUNE 23: Starting pitcher Sean Sullivan #45 of the Colorado Rockies delivers a pitch in the first inning against the Boston Red Sox at Coors Field on June 23, 2026 in Denver, Colorado. (Photo by Justin Edmonds/Getty Images) | Getty Images

Just about three months ago, the Rockies opened up the 2026 season in Miami against the Marlins.

It didn’t go very well.

Colorado got swept 3-0, but the good news is that the Rockies lost each game by one run, including a walk-off 4-3 loss in game three. Now, the 1993 expansion teams will face each other again, but this time for a four-game series at Coors Field.

The Rockies (33-50) have gone 5-5 in their last 10 games and are 18-22 at home this season. The Marlins (44-40) have been on a hot streak, going 8-2 in the last 10 games. Miami’s success is largely due to its successful employment of small ball and MLB-leading 92 stolen bases.

Making his fourth MLB start, Sean Sullivan (0-2, 8.25 ERA) will try to help the Rockies earn their first win over the Marlins this season. After throwing three scoreless innings against the A’s in his debut, the 23-year-old lefty struggled in start No. 2 when he gave up eight runs on nine hits, including two homers, in four innings against the Chicago Cubs. He was better in his last outing, when he surrendered three runs on five hits with five walks and three strikeouts in five innings against the Boston Red Sox.

The 2022 NL Cy Young winner, Sandy Alcantara (8-4, 4.01), will be on the mound for Miami. Alcantara, 30, has also been on a hot streak in June, posting a 2.60 ERA and a 5-0 record with 29 strikeouts and only six walks in 34.2 innings.

First Pitch: 6:40 p.m. MDT

TV: Rockies.TV

Radio: 850 AM/94.1 FM KOA Rockies Radio Network; KNRV 1150 AM (Spanish)

Lineups:

For the Marlins:

The penultimate lineup of June.

: https://t.co/pMAEOPHNJ8
: @MarlinsRadio, @radiomambi710, @1043wqam
: 8:40 PM ET#FightinFishpic.twitter.com/9OUQaxFUHo

— Miami Marlins (@Marlins) June 29, 2026

For the Rockies:

First of a four game set with the Marlins. pic.twitter.com/OFn4SoSACq

— Purple Row (@PurpleRow) June 29, 2026

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