Kingston, who lost his card last season, hit four birdies in his final seven holes.
"You are not automatically invited into most of these events, so it's tough to plan your schedule," he told reporters after carving out a one-shot lead over Finland's Mikko Ilonen.
"It takes one good week and things change, so I am hoping to make the best of this week.
World No.2 Rory McIlroy endured a disappointing day, finishing the day on two-over par following his round of 74.
He told reporters: "It was tricky. The conditions obviously were not ideal, so it is tough to shoot a low score out there. I felt I was doing well after the first 12 holes but I just let the round get away from me.
"In the first 12 holes I didn't really miss a shot, but I am not getting as much out of my rounds as I should do."