Charl Schwartzel leads The European Tour challenge at the Northern Trust Open, where halfway leader Bae Sang-moon is hoping to learn from his mistakes.
The 27 year old Bae led the way going into the weekend at the same tournament last year, only to experience a disappointing third round.
He is determined to right that wrong, though, after a bogey-free five under 66 put him ahead of the pack on Friday.
"It was really, really good experience, and I learned a lot," Bae said.
"I improved a lot from last year."
He leads Aaron Baddeley and Robert Garrigus by a shot on nine under, with Baddeley going for a first US PGA Tour win since victory at this tournament in 2011.
The Australian was in danger of being an also-ran until he found some form on the back nine, birdieing six of the holes including four in a row to the finish.
Charlie Beljan is fourth on the ladder on seven under, with first round leader Dustin Johnson one of four players on six under. Johnson struggled to repeat this Thursday form and signed for a one under 70.
Schwartzel sits tied for ninth on five under following a 68, while England's Lee Westwood is three under.
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