Sean O'Leary

Sean O'Leary

Joined: Oct 12, 2025

Sean O'Leary is an alumnus of the University of Nevada, Reno, where he majored in journalism. Before On SI, he covered baseball at websites such as Pitcher List and FanSided. Sean also covered the Triple-A affiliate of the Arizona Diamondbacks, the Reno Aces, for their official website. Watching minor league baseball over the years made him fascinated by covering prospects.

Feb 21, 2026; Port St. Lucie, Florida, USA; Miami Marlins first baseman Christopher Morel (5) tosses the ball to relief pitcher Tyler Phillips (not pictured) to retire New York Mets first baseman Jose Rojas (not pictured) during the third inning at Clover Park.

Apr 4, 2026; Bronx, New York, USA; Miami Marlins catcher Agustin Ramirez (50) catches a foul ball hit by New York Yankees designated hitter Giancarlo Stanton (27) (not pictured) during the third inning at Yankee Stadium.

Mar 27, 2026; Miami, Florida, USA; Miami Marlins starting pitcher Sandy Alcantara (22) returns to the dugout against the Colorado Rockies during the first inning at loanDepot Park. M

Sep 18, 2025; Denver, Colorado, USA; Miami Marlins shortstop Otto Lopez (6) rounds the bases on a solo home run in the third inning against the Colorado Rockies at Coors Field.

Feb 23, 2025; Port St. Lucie, Florida, USA; Miami Marlins pitcher Robby Snelling throws a pitch during the second inning against the New York Mets at Clover Park.

News

A pair of lefties and recently drafted position players prove that the Miami Marlins continue to develop young players.

Jun 22, 2021; Omaha, Nebraska, USA; Mississippi State Bulldogs right fielder Tanner Allen (5) gestures after hitting a three-run home run against the Virginia Cavaliers at TD Ameritrade Park.

News

Former Marlins prospect Tanner Allen will be playing in the exciting exhibition league next year.

Sep 28, 2025; Miami, Florida, USA; Miami Marlins starting pitcher Edward Cabrera (27) catches the baseball against the New York Mets during the first inning at loanDepot Park.

News

Without any pending free agents to re-sign, the in-house focus in Miami will be on the arbitration eligible players.

Sep 26, 2025; Miami, Florida, USA; Miami Marlins pinch hitter Connor Norby (1) circles the bases after hitting a two-run home run against the New York Mets during the fifth inning at loanDepot Park.

News

The door at third base is wide open as the Miami Marlins head into 2026.

Sep 19, 2025; Arlington, Texas, USA; Miami Marlins designated hitter Agustin Ramirez (50) hits a double during the third inning against the Texas Rangers at Globe Life Field.

News

Ramirez had a good year with the bat, but was a mess behind the plate and could get surpassed because of it.

Sep 16, 2025; Denver, Colorado, USA; Miami Marlins pitcher Ronny Henriquez (32) delivers a pitch in the ninth inning against the Colorado Rockies at Coors Field.

News

In a year where the Miami Marlins had a big turnaround, the bullpen was the most improved part of the roster.

News

Known for their pitching in recent years. the rotation was not up to par despite the team finishing third.

Apr 24, 2024; Atlanta, Georgia, USA; A detailed view of a Miami Marlins hat and glove in the dugout before a game against the Atlanta Braves at Truist Park.

News

The Marlins sent eight players to play for Mesa in the AFL, but a majority of them are already struggling.

Feb 23, 2025; Port St. Lucie, Florida, USA; Miami Marlins pitcher Robby Snelling throws a pitch during the second inning against the New York Mets at Clover Park.

The top farm system of the Miami Marlins shined once again throughout 2025.