Rory McIlroy shot an opening round 73 in The Player's Championship at Sawgrass on Thursday and afterwards revealed he's aggravated a back probem.
The world number two lies on one over par and six off the leaders William McGirt and MacKenzie Hughes.
Speaking to reporters after his round he admitted that he didn't get in as much practice as he would have liked.
"My back has got a little bit stiff again, I guess just from obviously building it up and playing through and then not doing anything for three weeks and then coming back last weekend and hitting balls for four or five hours a day," he said.
McIlroy played just nine holes at Sawgrass before teeing off in the tournament.
"I didn't hit enough fairways, didn't hit enough greens, I felt like I was scrambling all day.
"I just aggravated that joint in my back again, the thing that sort of happened at the start of the season. I've sort of been trying to rest that and manage that, so I think that's why I'm a little bit rusty, as well."
