Korda rebounded from an opening 72 with a dazzling 6-under 66 at Tiburon Golf Club on a sunny, windswept day in south Florida. The bogey-free round included a hole-out for eagle on the third hole. The World No. 1 headed to the range after Thursday’s round and came away with one simple swing thought.

Sometimes, one little swing thought can change everything—even for the best player in the world. World No. 1 Nelly Korda bumbled to an even-par 72 on Thursday at the CME Group Tour Championship, a round well below her standard.

Angel Yin had a 3-under 69 that gave her a two-shot lead in the CME Group Tour Championship and the chase for the $4 million prize. Four back was Nelly Korda, who rebounded Friday with a 66.