Royals rookie Billy Butler -- who went 4-5 with a homer in his most recent outing -- is the latest, fresh young outfielder to lay claim -- however tenuous -- to everyday playing time.
Butler -- who starts at designated hitter -- has won favor with a better than .300 batting average and a slugging percentage approaching .500, all with a decent eye for the strikezone.
Butler stands to hold the job at least until battered veteran Mike Sweeney returns from the disabled list, which might not be for some time.
Other outfielders recently emerging with potential, permanent, full-time playing status in their sights include the Athletics Travis Buck, the Indians Franklin Gutierrez, the Rockies Ryan Spilborghs and the Pirates Ryan Doumit.
Keep an eye out for Shelley Duncan of the Yankees.
Doctor X -- the 'Baseball Medic' -- is an anonymous U.S. government trauma specialist with a Duke University sports medicine background and more than 20 years experience in emergency medicine. From time to time he considers MLB rumors, events and news reports as they pertain to baseball players' injuries, illnesses and various other disabilities, both on the field and off.
MLB Rumors editor Greg Fieg is a former sports news editor and award-winning writer whose bylines have appeared on the wires of the Associated Press and in numerous publications, including San Antonio Express-News, San Antonio Light, Houston Chronicle and Philadelphia Bulletin. He formerly was posted in various positions on the U.S.-Mexican border with Freedom Newspapers, and was a regular, independent contributor to United Press International.