(AP Photo/Stephen B. Morton)

HILTON HEAD ISLAND, S.C. (AP) Cameron Smith birdied the difficult 17th and 18th holes at Harbour Town to shoot a 9-under 62, his career low on the PGA Tour, and take a one-shot lead over Stewart Cink at the RBC Heritage on Thursday.

Cink finished his 63 around lunchtime and no one appeared likely to beat that score in overcast, breezier afternoon conditions. Yet Smith played his best down the challenging stretch.

The Australian chipped in for birdie on the par-3 17th, then stuck his approach to the lighthouse finishing hole within 5 feet to take the lead. Smith surpassed his previous low of 63, accomplished three times on tour.

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