Phil Mickelson was a star at Arizona State before he turned pro, and he won the NCAA individual championship three times (1989, '90 and '92). Mickelson, shown here in his college days, also won the Phoenix Open as an amateur.
2 of 22Robert Beck
Mickelson beat both Tiger Woods and Mark O'Meara by one stroke to win the 1998 Mercedes Championships at La Costa. He also won the tournament in 1994.
3 of 22Elise Amendola / AP
Mickelson lost the 1999 U.S. Open by one stroke to Payne Stewart. It was the first of six second place finishes in the U.S. Open for Mickelson, who has never won the event.
4 of 22Lenny Ignelzi / AP
Mickelson won the 2000 Buick Invitational to end Tiger Woods's streak of six consecutive victories.
5 of 22Bob Martin/SI
After more than 20 PGA Tour wins, Mickelson finally won his first major championship at the 2004 Masters when he drained a downhill 18-footer on the 72nd hole at Augusta National.
6 of 22John Biever/SI
Mickelson received the green jacket from fellow lefty Mike Weir.
7 of 22Chuck Soloman/SI
Mickelson won his second major at the 2005 PGA Championship at Baltusrol. At the par-5 18th, he got up-and-down from the greenside rough for birdie to edge Steve Elkington and Thomas Bjorn by one shot.
8 of 22Simon Bruty/SI
At the 2006 Masters, Mickelson was paired in the final twosome with longtime friend Fred Couples. Mickelson shot a 69 on Sunday to win his second green jacket.
9 of 22Simon Bruty/SI
Longtime rival Woods presented Mickelson with the green jacket.
10 of 22Chuck Solomon/SI
Needing a par to win his first U.S. Open in 2006, and his third-straight major, Mickelson's drive on the 18th at Winged Foot bounced off a tent and landed in the trees left of the fairway. He attempted to go around a tree with his second shot but hit it, which led to a double bogey and Geoff Ogilvy's victory.
11 of 22Al Tielemans/SI
Afterward Mickelson, who made the SI cover, was blunt. "I just can't believe that I did that. I am such an idiot. I can't believe I couldn't par the last hole. It really stings."
12 of 22Robert Beck/SI
Mickelson's Ryder Cup record going into the 2008 competition at Valhalla Golf Club in Louisville was shaky, but he partnered successfully with Anthony Kim to help lead the U.S. team to victory.
13 of 22Robert Beck/SI
Mickelson's wife, Amy, and his mother, Mary, were diagnosed with breast cancer in 2009. After taking time off, Mickelson returned to a supportive fan base, and his wife's and mother's conditions have improved.
14 of 22Robert Beck / SI
At the 2010 Masters, Mickelson's second shot from the pine straw on the par-5 13th hole paved the way to another victory.
15 of 22Robert Beck/SI
He shot a final-round 67 to beat Lee Westwood by three shots and secure a third green jacket.
16 of 22Jon Super / AP
Mickelson carded a 30 on the front nine during the 2011 British Open but fell apart on the back. He finished two under par and tied for second with Dustin Johnson.
17 of 22Robert Beck / SI
Mickelson shot a scorching 64 on Sunday to win the 2012 AT&T Pebble Beach National Pro Am.
18 of 22Brian Snyder / Reuters
At the 2012 Masters, Mickelson was in contention until a disastrous triple-bogey 6 on the par-3 fourth in the final round. He tied for third.
19 of 22Marc Serota/Getty Images
In honor of his 42 career victories and four major championship wins, Phil Mickelson was inducted into the World Golf Hall of Fame on May 7, 2012.
20 of 22Robert Beck / Sports Illustrated
At the 2013 U.S. Open at Merion, Mickelson started the final round with a one-shot lead, but he shot a final-round 74 to lose to Justin Rose by two strokes. "I think this was my best chance," Mickelson said. "I think that the way that I was playing heading in, the position I was in and the way I love the golf course."
21 of 22Warren Little/Getty Images
Mickelson rebounded a month later with his first win on a links course at the 2013 Scottish Open at Castle Stuart.
22 of 22Bob Martin / Sports Illustrated
A week later, Mickelson birdied four of the last six holes to capture his fifth major championship with a three-shot win at the Open at Muirfield. "This is just a day and a moment that I will cherish forever," he said. "This is a really special time, and as fulfilling a career accomplishment as I could ever imagine."
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