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Peter
O'Brien
Right Fielder
Birthdate
7/15/1990
BAT/THR
Right/Right
Birthplace
Miami Gardens, FL
College
Miami
Overview
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Royals
MLB
Royals call up relievers Maness, Alburquerque
9Y
Steven King/Icon Sportswire
MLB
D-backs trade O'Brien to Royals for minor leaguer
10Y
Christian Petersen/Getty Images
Diamondbacks
MLB
Diamondbacks recall OF O'Brien from Reno
10Y
Christian Petersen/Getty Images
Diamondbacks
MLB
MLB
Previewing the next wave of prospect call-ups
11Y
Jim Bowden
Getty Images
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MLB News
Inside access as White Sox make Cholowsky No. 1 MLB draft pick
Roch Cholowsky or Grady Emerson? Here's how Chicago's No. 1 pick decision played out hours before the 2026 draft began.
July update: 2026 top 10 prospect rankings for all 30 MLB teams
Who is rising and falling in every major league farm system after the MLB draft? Kiley McDaniel digs in.
Cease, bullpen combine on 3-hitter in AL's 4-0 win, first All-Star shutout since 2013
— Dylan Cease struck out the side in the first inning, combining with 10 relievers on a three-hitter in a show of pitching dominance that led the American League to a 4-0 win over the National League in Tuesday night's All-Star Game.
AL walks out victorious in Philadelphia
The American League comes out of Philadelphia with a 4-0 win thanks to MVP Cody Bellinger.
MLB All-Star Game 2026: Analysis, takeaways from Philly
Baseball's best came to play. Relive all the action from the American League's dominant victory over the National League.
Cease, bullpen silence NL in 15-K shutout as AL wins All-Star Game
Starting pitcher Dylan Cease combined with 10 relievers in a dominant three-hit, 15-strikeout shutout of the National League in a 4-0 win in Tuesday night's All-Star Game.
