A report on the Diamondbacks' Web site Friday said Sexson made the decision after getting a second second opinion this week from Dr. James Andrews in Birmingham, Ala. Andrews recommended surgery, as had Dr. Michael Lee, the team physician.
"He didn't tell me what I didn't already know," Sexson said. "It's very hard. Nobody wants to go through this ... I feel like I'm letting my teammates down."
Team officials said the decision to go ahead with the surgery will allow Sexson to be at full strength for the 2005 season.
Sexson originally was injured in a game against the Chicago Cubs April 28 and placed on the 15-day disabled list. He returned to action after three weeks of rehabilitation but, in his second game back, his shoulder slipped out of place on a checked swing and he was placed back on the DL with an injury diagnosed as a torn labrum.