"Ultimately, just 'cause you don't look like an athlete doesn't mean you're not an athlete," Pettersson said. "We're not running a marathon out here, we're walking 18 holes."
And no one walked them better this week at Harbour Town Golf Links than Pettersson. He finished at 14-under to win his fifth PGA Tour title and first since 2010. Pettersson also tied countryman Jesper Parnevik for most ever on tour by a Swedish player.
Pettersson, second in the Houston Open 2 weeks ago, earned $1,026,000.
He remembers in 2009 feeling like he needed to trim down to play better. He worked out more, ate right, dropped 30 pounds - and couldn't swing the club. He vowed to beef up and rediscover his game. The regimen?
"Well, you drink 10 beers and [eat] a tub of ice cream before bed," Pettersson said. "That puts it on quickly."
Top-ranked Luke Donald needed to finish eighth or better to retain his ranking, but tied for 37th and will fall behind Rory McIlroy. He had a 4-week run at No. 1 and said he has proved he is among the world's best and is confident he'll stay in that conversation, no matter where he's ranked.
Masters winner Bubba Watson and most of the world's best took the week off.
In other tournaments:
* Michael Allen won the Encompass Insurance Pro-Am in Lutz, Fla., for his second Champions Tour title.
* Louis Oosthuizen won the Malaysian Open in Kuala Lumpur, a week after losing the Masters playoff with Bubba Watson.