Justin Rose has been forced to pull out of the WGC-Bridgestone Invitational with back spasms.
Rose was due to tee off alongside Henrik Stenson on Thursday but withdrew through injury on the eve of the tournament.
There is no confirmation yet whether Rose - the 2013 U.S. Open winner - will be fit to play in the US PGA Championship next weekend.
Adam Hadwin has also abandoned his campaign at Firestone due to a hip problem.
The Canadian is said to be working with his doctor to be ready for the fourth and final major of the year.
