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Player	Pos	Seasons	Born	Birthplace
Brett Oberholtzer	P	2013-15	Jul 1, 1989	Christiana	DE
Ken Oberkfell	3B/1B/2B	1990-91	May 4, 1956	Highland	IL
Jim Obradovich	1B	1978	Sep 13, 1949	Fort Campbell	KY
Jake Odorizzi	P	2021	Mar 27, 1990	Breese	IL
Darren Oliver	P	2004	Oct 6, 1970	Kansas City	MO
Gregg Olson	P	1996	Oct 11, 1966	Scribner	NE
Javier Ortiz	OF	1990-91	Jan 22, 1963	Boston	MA
Russ Ortiz	P	2009	Jun 5, 1974	Van Nuys	CA
Dan Osinski	P	1970	Nov 17, 1933	Chicago	IL
Claude Osteen	P	1974	Aug 9, 1939	Caney Springs	TN
Al Osuna	P	1990-93	Aug 10, 1965	Inglewood	CA
Roberto Osuna	P	2018-20	Feb 7, 1995	Juan Jose Rios	MX
Roy Oswalt	P	2001-10	Aug 29, 1977	Kosciusko	MS
Jim Owens	P	1964-67	Jan 16, 1934	Gifford	PA
Rudy Owens	P	2014	Dec 18, 1987	Mesa	AZ