Lahiri, who is playing his first event of 2019, is now four-under 136.
Kuchar ran off four birdies in five holes to start his second round Friday, handled the par 5s at Waialae again and finished with another round 63.
"To shoot 7 under back-to-back is unexpected, but awfully excited," said Kuchar. Kuchar was at 14-under 126, matching the lowest 36-hole score of his PGA TOUR career.
Putnam, playing in the afternoon, had a bogey-free 65 and was one shot behind. Chez Reavie (65) and Stewart Cink (62) were four behind. Reavie made more eagles three - than birdies, of which he had only one.
Jordan Spieth had a short week despite a 66 in second round and missed the cut by one shot. He had 73 in the first round.
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