Tiger Woods withdrew from the WGC-Bridgestone Invitational during Sunday's final round, sparking fears that he had suffered further serious damage to his back.

Playing just his third event since undergoing microdiscectomy surgery in March, Woods was four over par after eight holes when he pulled out on the ninth hole at Firestone Country Club.

The former world number one looked in severe pain after hitting his tee shot on the par four, wincing as he struggled to bend down to pick up his tee.

And moments later he was on a golf cart being driven straight to the car park where he again looked in real discomfort as he prepared to leave a venue where he has won eight times, including by seven shots last year.