Champ outlasted Canada's Corey Conners, who got married last weekend and almost won his first PGA title but settled for his best tour result, shooting 68 to finish on 271.
"Just to see those putts go in and the confidence it gives me through the rest of my game really helped this week", Champ said. "But on the back side I brought it all together and finished strong".
Champ's swing speed exceeds Tour average by over 10 miles per hour and his effortless motion suggests he will have a long career mashing golf balls down the fairway.
Champ nailed a 35-footer at the 16th and holed from 15 feet to save par at the next to take a two-shot lead to the final hole, where he made a seven-foot birdie for victory and Conners finished with a three-putt bogey. He cruised through the first six holes at 1 under, but back-to-back bogeys on Nos.
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According to ITV's Chris Ship , she is also wearing a woven "Korowai" or traditional Maori cloak. Prince William and Catherine, the Duchess of Cambridge (aka Kate Middleton ) rarely do it.
Even with that impressive stretch, Champ could only push ahead by two shots because Conners birdied two of those four holes as well.
Carlos Oritz fired a round-of-the-day 64 to finish five off the pace in tied-third alongside Sam Burns, while Scotland's Martin Laird ended the week in a share of seventh after a final-round 70.
However, Champ responded superbly with four birdies in succession from the 13th, the last with a putt from 35 feet.
Both birdied the par-3 13th but Champ followed by sinking a 19-foot birdie at the par-5 14th while Conners blasted out of a bunker and missed an 18-foot birdie putt. Ben Silverman (71) of Thornhill, Ont., tied for 39th with Adam Svensson (68) of Surrey, B.C.