Kuchar made an 11-foot birdie putt off the back fringe at No. 2 before a bogey on the next hole when he took two shots from a greenside bunker.

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Edward Stimpson, a Massachusetts amateur champion, devised the first Stimpmeter in 1935, after watching Gene Sarazen putt off a green at that year's U.S. Open at Oakmont and deciding it was unfair.

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Vicar's son Willett had threatened to spring an upset when he sank a 50-foot eagle putt from off the green at the long 14th to go into the joint lead.

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