South Korean Kim Si-woo fired a five-under par 66 on Saturday to seize a one-shot lead over two-time major champion Justin Thomas and Andrew Novak after 54 holes at the US PGA Tour's RBC Heritage in South Carolina.
Kim, a four-time PGA Tour winner, had six birdies through the first 15 holes, pushing his lead to as many as three before a bogey at the par-four 18th -- where overnight leader Thomas birdied to pull within one.
"I played great," Kim said. "Only missed the last hole so that's not a big deal. I played pretty much 35 holes really decent, so I'm not going to worry about the last hole for tomorrow.