Washington Nationals outfielder Adam Eaton has undergone surgery to repair his torn left anterior cruciate ligament and started a rehabilitation program Wednesday that is expected to last six to nine months.
The injury occurred April 28 in a game against the New York Mets, when Eaton stepped on first base awkwardly while beating out an infield hit.
Eaton was batting .287 with two homers and a .393 on-base percentage when the injury occurred.
The Kansas City Royals promoted Seth Maness from triple-A Omaha, less than nine months after the right-hander had ligament surgery on his pitching elbow. Kansas City...