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	Name Oakland Athletics  (Oakland Athletics) Oakland Raiders  (Oakland Raiders) Charles Oakley  (New York Knicks) Adam Oates  (Boston Bruins) Adam Oates  (Detroit Red Wings) Johnny Oates  (Los Angeles Dodgers) Ed O'Bannon  (Dallas Mavericks) Larry O'Bannon  (Louisville Cardinals) Shane O'Brien  (Anaheim Ducks) Greg Oden  (Ohio State Buckeyes) Greg Oden  (Portland Trail Blazers) Lamar Odom  (Los Angeles Clippers) Lamar Odom  (Miami Heat) Neil O'Donnell  (New York Jets) Ron Oester  (Cincinnati Reds) Ben Oglivie  (Detroit Tigers) Adewale Ogunleye  (Miami Dolphins) Bob Ojeda  (New York Mets) Bobby Ojeda  (New York Mets) Emeka Okafor  (Charlotte Bobcats) Hideki Okajima  (Boston Red Sox) Christian Okoye  (Kansas City Chiefs) Akeem Olajuwon  (Houston Rockets) Hakeem Olajuwon  (Houston Rockets) Fredrik Olausson  (Detroit Red Wings) John Olerud  (New York Mets) John Olerud  (Toronto Blue Jays) Rostislav Olesz  (Florida Panthers) Al Oliver  (Los Angeles Dodgers) Al Oliver  (Pittsburgh Pirates) Al Oliver  (Texas Rangers) David Oliver  (Dallas Stars) Miguel Olivo  (Birmingham Barons) Neal Olkewicz  (Washington Redskins) Kevin Ollie  (Connecticut Huskies) Luis Olmo  (Brooklyn Dodgers) Bert Olmstead  (Montreal Canadiens) Bert Olmstead  (Toronto Maple Leafs) Michael Olowokandi  (Los Angeles Clippers) Garrett Olsen  (Baltimore Orioles) Greg Olsen  (Chicago Bears) Greg Olsen  (Miami Hurricanes) Merlin Olsen  (Los Angeles Rams) Ryan O'Marra  (Juniors/College) Ryan O'Marra  (New York Islanders) Ryan O'Marra  (Team Canada) Deltha O'Neal  (Cincinnati Bengals) Shaquille O'Neal  (Cleveland Cavaliers) Shaquille O'Neal  (Los Angeles Lakers) Shaquille O'Neal  (Miami Heat) Paul O'Neill  (New York Yankees) Magglio Ordonez  (Chicago White Sox) Magglio Ordonez  (Detroit Tigers) Jesse Orosco  (New York Mets) Jesse Orosco  (San Diego Padres) Bobby Orr  (Boston Bruins) Vladimir Orszagh  (Nashville Predators) David Ortiz  (Boston Red Sox) Kyle Orton  (Chicago Bears) Kyle Orton  (Purdue Boilermakers) Chad Orvella  (Tampa Bay Rays) David Osborn  (Minnesota Vikings) Chris Osgood  (Detroit Red Wings) Chris Osgood  (Detroit Red Wings) Chris Osgood  (New York Islanders) Patrick O'Sullivan  (Juniors/College) Patrick O'Sullivan  (Mississauga Ice Dogs - OHL) Patrick O'Sullivan  (Mississauga IceDogs) Roy Oswalt  (Houston Astros) Amos Otis  (Kansas City Royals) Ed Ott  (Pittsburgh Pirates) Jim Otto  (Miami Hurricanes) Jim Otto  (Oakland Raiders) Maxime Ouellet  (Juniors/College) Michel Ouellet  (Minor League (AHL/IHL)) Michel Ouellet  (Wilkes-Barre/Scranton Penguins) Alexander Ovechkin  (Washington Capitals) Dave Owen  (Chicago Cubs) Spike Owen  (Boston Red Sox) Buster Owens  (Green Bay Packers) Rich Owens  (Miami Dolphins) Steve Owens  (Detroit Lions) Steve Owens  (Oklahoma Sooners) Terrell Owens  (Dallas Cowboys) Terrell Owens  (Philadelphia Eagles) Terrell Owens  (San Francisco 49ers) Sandis Ozolinsh  (Florida Panthers)