Morse will have arthroscopic surgery to repair cartilage damage in his right knee and is expected to be out 4-6 weeks, the team said Wednesday. The 24-year-old shortstop was optioned to Triple-A Tacoma last week where he sustained the injury. (Updated 7/6/2006) Analysis: Morse was batting .287 with seven RBIs in 21 at-bats over 10 games for the Mariners.