After a tumultuous, tabloid-filled offseason, Woods kicked off his 2010 season at the Masters (left), where he finished tied for fourth. He went on to finish winless on the year, a first for his professional career.
2 of 10Fred Vuich/SI
Louis Oosthuizen built a five-shot lead through two rounds at the British Open at St. Andrews, then surprised the world by rolling nearly unchallenged to a seven-stroke victory that came the same day South Africa celebrated Nelson Mandela's 92nd birthday.
3 of 10Robyn Beck/AFP/Getty Images
Northern Ireland's Graeme McDowell became a national hero after winning a tough U.S. Open at Pebble Beach and clinching the Ryder Cup in the final singles match. He capped his season by stunning Tiger Woods in a playoff at Tiger's own Chevron World Challenge event (left) after coming back from four strokes behind.
4 of 10Timothy A. Clary/AFP/Getty Images
Nobody could remember a wetter Ryder Cup, not that rain in October is unusual for Wales. The wet conditions pushed the event to an exciting Monday finish, where Colin Montgomerie's European team held off the U.S. by one point.
5 of 10Kohjiro Kinno/SI
Starting the final round with a three-shot lead, Johnson, a two-time AT&T Pebble Beach winner, was in prime position to win his first major. But his chances ended quickly after a triple bogey on No. 2, followed by a double bogey on No. 3. Johnson shot an 82 to tie for eighth.
6 of 10Scott Halleran/Getty Images
Tiger Woods's run as the world's No. 1 player finally ended after 281 weeks when England's Lee Westwood replaced him atop the world rankings. In his first appearance as No. 1, at the HSBC Champions in Shanghai, Westwood posed with Woods for a photo op in which they wielded tai chi swords.
7 of 10Darren Carroll/Getty Images,Steve Helber/AP
Paul Goydos (left) joined the 59 club in the opening round of the John Deere Classic in mid July. Stuart Appleby finished birdie-birdie for his Sunday 59 and a dramatic one-stroke victory in the inaugural Greenbrier Classic in August.
8 of 10John Biever/SI
Dustin Johnson unknowingly played his second shot on the 72nd hole at the PGA Championship from a bunker and grounded his club. After a long discussion with rules officials, Johnson was assessed a two-stroke penalty and knocked out of the playoff.
9 of 10Fred Vuich/SI
Phil Mickelson won his third green jacket, then dedicated the victory to his wife, Amy, who had been battling breast cancer since 2009.
10 of 10John Biever/SI
As Woods and Mickelson, the longtime No. 1 and No. 2 players in the world, slumped, new young stars seemed to come out of the woodwork and offer golf a glimmer of hope for the future. Germany's Martin Kaymer (left) won the PGA Championship, Dustin Johnson made a big impression at the Open and the PGA, Japanese teen Ryo Ishikawa shot 58 in one of his wins in Japan, and American Rickie Fowler was named the PGA Tour's Rookie of the Year over Northern Ireland's Rory McIlroy, who won the Wachovia Championship.
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