Justin Thomas had 11 birdies Thursday at Harbour Town, which allowed him to tie the course record with a 10-under 61 to lead the RBC Heritage.

Justin Thomas equals course record to take three-shot lead at RBC Heritage - Thomas carded 11 birdies in his opening round 61 at Hilton Head.

At 10 under, Thomas commands a three-stroke lead over world No. 1 Scottie Scheffler and Arnold Palmer Invitational winner Russell Henley. Battling a bad back, former U.S. Open champion Wyndham Clark impressed in the early afternoon hours with a 65 of his own to stand four adrift.