"Major leaguers" refers to professional athletes who play in the highest level of competition in a particular sport, such as Major League Baseball or Major League Soccer. Full definition
Do any of these guys have potential as major leaguers? (sbnation.com)
They are all sons of former major leaguer Jose Ortiz, who also was once MVP of the Pacific Coast League for the Sacramento River Cats in 2000. (sportstarsmag.com)
Some of them may try to hide when they see him coming, but there are probably only a handful of major leaguers in uniform who haven't seen the Clown Prince of Baseball at one time or another. (si.com)