Armed with a three-stroke advantage with just two holes remaining, Kuchar held firm and, after a cast-iron par at the penultimate hole, he completed a comprehensive win with his 24th birdie of the tournament at the 72nd hole.
The victor of the Mayakoba Classic in Mexico in November, world No.32 Kuchar briefly surrendered the lead to Putnam after three bogeys in his first five holes on Sunday.
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Kuchar ended a four-year drought by winning the Mayakoba Classic in Mexico last fall, and there are a few similarities.
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Mitchell played a bogey-free round of 63, including four straight birdies on Nos. It wasn't easy because it never is on the PGA Tour, but it was simple and as low-stress as wins get. He holed out for eagle three times from the fairway - a sand wedge from 101 yards on No. 10 at the start of his round; a 9-iron from 149 yards on No. 16, and a gap wedge from 135 yards on No. 6. He won the Match Play Championship and the Memorial in 2013. "To shoot seven-under back-to-back is unexpected, but certainly awfully exciting", said Kuchar, who finished his front nine by making an eagle on the par-five hole. "To win two out of three is insane to comprehend".
He returns in two weeks at Torrey Pines.
Lahiri, who is playing his first event of 2019, is now four-under 136.
Experience definitely counts for something and helps explain Davis Love III's solo seventh finish at age 54, his best result since his 2015 Wyndham Championship victory. I can't even pretend to be concerned about that, and he's now finished in the top 20 in all four Sonys he's played. Kuchar denied the number after the third round and said the two had an agreement in place at the start of the week. Jordan Spieth had a short week despite a 66 in second round and missed the cut by one shot.
In total, Reavie posted an incredible three eagles without attempting a putt in a single round, the most of any round on record on the PGA Tour. "I know I can't coast". "I have to stay aggressive".