Baseball, surnames starting with O: showing 97–144.

• JOJerry OwensChicago White Sox, RF
• JOJesus OrdonezColorado Rockies, C
• Jhailyn OrtizPhiladelphia Phillies, RF
• Joe OrtizTexas Rangers, RP
• Joey OrtizBaltimore Orioles, SS28years old
• Johan OviedoSt. Louis Cardinals, SP28years old
• JOJohn O'ReillyPittsburgh Pirates, RP
• JOJohn OlerudNew York Yankees, 1B
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