Lahiri, who was unable to get into the Masters for the second year, had one birdie and two bogeys, all in the first five holes, before he went through 13 straight pars at the Par-71 Harbour Town Golf Links.
The 30-year-old Indian, who has slipped to 86th in World Rankings, is lying Tied-69th and will need to shoot a steady second round to stay on for the weekend.
Meanwhile, Rory Sabbatini stole the show with a 7-under 64 in the opening round. The six-time PGA TOUR winner played through back pain and went bogey-free for a two-shot lead. He was not sure he was hundred per cent in the morning and unsure whether he was going to play or not.
John Huh, Billy Horschel, Chesson Hadley and 2014 RBC champion Matt Kuchar all shot 66 and are just two shots back.
Sabbatini has only missed the FedExCup Playoffs once, in 2016, since the FedExCup era began in 2007. He showed glimpses of his former self with a T5 at the Valspar Championship last month and a T17 at The Honda Classic before that.
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