Lahiri, however, continues to be well-placed in the race to grab one of the 25 all-important PGA Tour cards for 2016 as he is fifth in the separate money list of the Four-event Final Series.
The Indian, who finished tied-sixth after having been in contention for two rounds last week at Hotel Fitness Championships, had a decent start before lapsing into a rough patch with three bogeys in four holes between the fifth and eighth holes.
Lahiri's driving off the tee was once again off as he managed only 50 per cent fairways and needed 32 putts, and found two-thirds of the greens in regulation.
Lahiri, winner of the Malaysian Open and Hero Indian Open, two prominent events on European Tour, has initially committed to only the first three events in the four-event Web.Com Tour Final series. But in those, he will need to stay in the top-25 of a Separate Money List compiled for the Final Series.
While Lahiri has said that he will take a break after the first three events and skip the Tour Championships to take a week off before the Presidents Cup, it remains to be seen what he will do if he is close to sealing the card after three events.