American Daniel Berger, who won last week at Colonial, had three birdies in his final four holes, including a chip-in two on the par-three 17th, as he shot a six-under 65 to join Hatton in third.
It was a thrilling final day at Harbour Town despite the PGA Tour’s second behind-closed-doors event finishing around three hours behind schedule because of a storm on the South Carolina coast.
At one point, six players shared the lead but Hatton, who won the Arnold Palmer Invitational in March, jumped clear to lead on 19 under with four birdies in five holes from the second. However, he was unable to build on that momentum, parring the next five holes and then trading a birdie for a bogey on the 12th and 13th, before picking up his final shot on the 16th.
Ancer, who did not miss a green in regulation in the final round, also picked up four birdies on the front nine to reach the turn at 19 under. Further birdies on the 15th and 17th left him needing another on the last to force a play-off but, with darkness descending, he was unable to hole a 37-foot putt.
That left Simpson, a dad of five, to celebrate his second victory on Father’s Day. His first came in 2012 when he won the US Open, which traditionally finishes on Father’s Day and had been scheduled to be played this week before the coronavirus pandemic hit. Victory, which came with a $1.35m first prize, took the 34-year-old American to fifth in the world rankings.
Ian Poulter, who led after round one, closed with a 68 to finish on 16 under, alongside fellow Englishmen Justin Rose (65) and Matt Fitzpatrick (68), while Rory McIlroy closed with a 70 and 11 under total.
Final leaderboard scores can be found here.