ST. LOUIS—Jim Furyk only wanted to give himself a chance in the BMW Championship, and it took 36 holes to do it on a marathon Saturday at Bellerive that put him atop the leaderboard for the first time all year.

Whether he stays there when everyone finishes the third round is still to be determined.

Furyk finished with five straight birdies to set the course record at Bellerive with an 8-under 62 in the second round, then followed with a 66 that put him at 12-under 198 and gave him the clubhouse lead.

Camilo Villegas, who shot 66 in the morning for a one-shot...

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