Baseball, surnames starting with O: showing 145–192.

• MOMichael OsinskiBoston Red Sox, SS
• Michel OtanezArizona Diamondbacks, RP29years old
• MOMiguel OjedaSan Diego Padres, C
• Miguel OlivoSeattle Mariners, C
• Mike O'ConnorWashington Nationals, RP
• Mike OltTexas Rangers, 3B38years old
• Nate OrfMilwaukee Brewers, 2B36years old
• NONathan OckerCleveland Guardians, RP
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Professional competitions only. Pick a competition to see everyone who has played in it, with games and seasons, or a club for its full list. Club pages also show the current squad and every former player we hold.