Boston ? Curt Schilling retired from baseball Monday, ending a career in which he won World Series titles with the Boston Red Sox and Arizona Diamondbacks and was one of the game’s most dominant pitchers and grittiest competitors.

The 42-year-old right-hander said on his blog he’s leaving after 23 years with “zero regrets.” Schilling missed all of last season due to a shoulder injury after signing a one-year, $8 million contract.

“The things I was allowed to experience, the people I was able to call friends, teammates, mentors, coaches and opponents, the travel, all of it, are far more than anything I ever thought possible in my lifetime,” he wrote.

Schilling had surgery last June and had said he might come back in the middle of this season though he was not under contract. He made no reference to his injury on his blog.

“Curt had a great career and made a profound impact on the Red Sox, helping to restore the Red Sox’ status as a championship organization,” general manager Theo Epstein said in an e-mail to the Associated Press. “He was consistently dominant, and never more so than when it mattered most. Not only for what he did — but for when and how he did it — Curt deserves to be remembered with the all-time greats.”