Shane Lowry opens Farmers Insurance with sizzling 66

Shane Lowry hit sparkling form on the front nine at Torrey Pines to card an opening round 66 at the Farmers Insurance.

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The 36-year-old, who started his round on the north course at the 10th, bounced back from successive bogeys to reel off six birdies in his final seven holes for a round of six-under par and two shots off clubhouse leader Kevin Yu, with a number of players yet to complete their first rounds.

Competing on the more challenging south course, compatriot Seamus Power endured a more challenging afternoon.

The Waterford native began with nine successive pars, and his first birdie came at the last, by which time he had bogeyed 11, 12 and 15.

The north and south courses at Torrey Pines are both used for the first two rounds before the final 36 holes are played on the south course on Saturday.