Cape Town - South Africa's top-ranked golfer, Branden Grace, has pulled out of the PGA Tour's Honda Classic ahead of the second round.
Grace, 28, withdrew shortly after his opening round of 77 at the PGA National in Florida on Thursday, due to a strained muscle in his shoulder.
Ranked 17th in the world, Grace posted a forgettable 7-over-par round, to lie 13 shots adrift of the joint leaders - in a round in which he failed to make a single birdie.
"Today I strained a muscle in my rotator cuff and had to WD @TheHondaClassic Tough to miss hometown event w/ some rest should be good nxtweek," Grace said on Twitter.
Grace told Sport24 earlier this month that injuries weren't a concern and that scheduling was vital to a player's consistency.
"If I choose the right schedule and play courses I know and can compete strongly over then I feel if your game is in good shape you will be consistent," said Grace.
"I'm obviously looking for wins, but failing that consistency is what you are looking for. If you can go through the season making every cut, have some top finishes and close calls then it is a top season."
The South African has contended at several majors and finished tied for 22nd at last week's Genesis Open at Riviera Country Club.
Grace will look to bounce back next week at the Mexico Championship starting on Thursday, March 2.