By Matt Hardy Former US Open winner Jon Rahm has said he is concerned about whether he can compete at Pinehurst this weekend. The Spaniard withdrew from the LIV Golf League event at Houston last weekend due to an infection in his left foot. “It’s a concern,” the 2021 winner Rahm said. “It’s doing better. But definitely still in pain. “Could I have dragged myself out there (on Saturday) and posted some kind of a score? Yeah. “But it was getting to a point where I wasn’t making the swings I wanted to make, and I could have hurt other parts of my swing just because of the pain. As to right now (p…