Battling the intense pain of an infected fingernail — his left ring finger — Sergio Garcia managed to grind out a four-under 66 on Thursday at the HP Byron Nelson Championship, putting himself near the top of the leaderboard and two shots behind first-round leader Jeff Overton. On Monday Garcia, who has played in every British Open since 1998, but has yet to qualify for Royal St. Georges in July, withdrew from the Open Qualifier after four holes because he couldn’t grip the club comfortably and the pain was so excruciating that he questioned whether he’d be able to tee it up later in the week at TPC Four Seasons.