Vijay Singh has pulled out of this week's Transitions Championship due to swelling in his right knee. Singh had arthroscopic surgery in January to repair torn cartilage.

"I've had a fine relationship with Vijay Singh over the years, and I knew how much he wanted to play in our tournament," said Gerald Goodman, tournament director of the Transitions Championship, in his blog. " He called me (Monday) from his doctor's office in Jacksonville and said his knee had become swollen over the weekend in Miami. He was so apologetic that he couldn't play."

The defending FedEx Cup champion has struggled since he returned from the operation. He missed the cut at Pebble Beach and at Riviera, lost in the second round of the Match Play, and finished T53 at Doral.