Rory McIlroy faded somewhat with a one over round of 73. Matt Fitzpatrick carded a solid round of 69 to reach -9 and be five shots off the lead.
Shauffele leads after round on -17 with Clark on 16, & Harman on -15. Matt Fitzpatrick is 4 behind on -13 & will need a fast start to have any chance.
Scottie Scheffler became the 1st player to retain the title at Sawgrass, with a one shot victory over Shauffele, Harman & Clark who had a chance to take it into a playoff only for his putt to lip out on the 18th.
Scheffler who had been battling a neck injury, posted the winning score with birdies on 16,17 & 18, a stretch of holes that are very challenging & demanding.
Irishman Seamus Power is in contention at the Valspar Championship just two shots off the lead at -8 going into the final round.
Scottie Scheffler is the 3rd round leader in the RBC Heritage Classic on -16, Sepp Straka is a shot back,
with Morikawa 2 behind. Ludvig Aberg is tied for 4th on -13.
Play was suspended on Sunday, with 18 players to complete their rounds on Monday. Wyndham Clark is the clubhouse leader on -15, with Cantlay, Poston & Theegala with holes to complete on the same score.
Scheffler is 5 clear with 3 holes to play, he could become the first player to win at Harbour Town following a Masters win since Langer in 1985.
^^ Scheffler completed victory, finishing on -19, with Theegala 3 shots behind in 2nd spot.