San Diego Padre right fielder Tony Gwynn, who was chasing his fifth National League batting title, underwent arthroscopic surgery on his left knee and probably is lost for the rest of the season, team doctor Jan Fronek said.
Gwynn, who led the NL in hitting for most of the season, had been bothered by the knee since sliding into second base at Houston in early August.
The injury to Boston left fielder Mike Greenwell isn't as serious as first thought, and he could rejoin the Red Sox within a week.
Greenwell underwent tests that showed he escaped serious injury in a fall while running out a grounder Tuesday night against Baltimore.
Arthur Pappas, the Red Sox's physician, said tests at the University of Massachusetts Medical Center in Worcester indicate that Greenwell may be back within one week, spiking the early word that he could be out for the season.
Pappas, who reported late Tuesday night that Greenwell sustained a pulled groin muscle and a possible torn cartilage in his right knee, said an examination showed only "a mild strain of a ligament on the inside of his knee."
Minnesota Athletic Director Rick Bay, 48, was named to succeed the retiring Hank Peters as president of the Cleveland Indians.
John Hart, 42, director of baseball operations for the Indians, will become general manager and vice president of baseball operations, Peters said at a news conference.