Simpson finished the 2016 PGA Tour season 144th in total putting. He improved to 95th this season before the FedEx Cup playoff finale Tour Championship.
Simpson is in a three-way tie for the Tour Championship lead after two rounds at East Lake Golf Club. He is 7-under par for the event and ninth overall in putting in the 30-player field. Simpson was 14th in Round 1 and fifth in Round 2.
“When you putt with something for 11 years and overnight you're forced to try something different, it's going to take a while,” Simpson said after his 3-under par 67 Friday. “So it was just I had to relearn a skill in the game that I played for 20 years of my life, so that was tough.”