Phil Mickelson, left, greets his wife Amy after winning his third Masters on April 11, 2010. Amy was diagnosed with breast cancer 11 months before and Phil said, "We've been through a lot this year. It means a lot to share some joy together. It's been such an incredible week, an emotional week. And to cap it off with a victory is something I can't put into words. It's something we'll share for the rest of our lives."

Phil Mickelson wears a hat with the Breast Cancer Awareness ribbon during his practice round at the U.S. Open on the Black Course at Bethpage State Park on June 17, 2009. Mickelson's wife Amy had been diagnosed with breast cancer just a bit before the tournament's start.

With Phil Mickelson taking a hiatus from golf after his wife Amy was diagnosed with breast cancer, the two took some time to watch the Lakers beat the Rockets in Game Five of the Western Conference Semifinals on May 12, 2009.

The United States' victory over Team Europe in the 2008 Ryder Cup was cause for celebration for Phil Mickelson and Amy.

Former US President George H.W. Bush (left) sits with Amy Mickelson during afternoon four-ball play on Sept. 19, 2008 during the 37th Ryder Cup at the Valhalla Golf Club in Louisville.

Wearing a festive red dress, Amy Mickelson accompanied husband Phil on the red carpet for the Ryder Cup Gala dinner prior to the start of the 2008 Ryder Cup.

World No. 2 Phil Mickelson poses with his wife, Amy, and children, (L-R) Sophia Isabel, Evan and Amanda Brynn, after winning the HSBC Champions golf tournament at the Sheshan International Golf Club in Shanghai on Nov. 11 2007.

Phil Mickelson is greeted by his wife Amy after winning the AT&T Pebble Beach National Pro-Am Feb. 11, 2007 in Pebble Beach, Cali. Mickelson finished the day 6 under par to finish the tournament 20 under.

Standing with the corps of golfers' wives and girlfriends, Amy Mickelson (right) cheered on the United States at the 2006 Ryder Cup.

Phil Mickelson of USA and wife Amy walk down the catwalk during the Ryder Cup Gala Dinner at Citywest Hotel and Golf Resort on Sept. 20, 2006 in Dublin.

Phil Mickelson (center) and wife Amy were awarded the 2006 "Spirit of the Warrior" Award by Colonel John T. Carney (USAF RET.), President of the 'Special Operation Warrior Foundation,' on July 4, 2006. The Mickelson's foundation, the PGA tour and PGA Tour Charities joined forces with other Tour players and fans to support the 'Special Operation Warrior Fund' and 'Homes for our Troops."

Phil Mickelson poses with wife Amy, son Evan (left), and daughter Sophia after a 13-stroke victory and 28-under par performance at the BellSouth Classic on April 2, 2006.

Amy Mickelson (center) jokes with husband Phil while waiting on the ninth tee during Thursday's Foursome matches of the 2005 Presidents Cup.

Following Phil Mickelson's final putt at the 2005 PGA Championship, wife Amy and children Sophia (left), Evan (center) and Amanda (back) ran out of the crowd to congratulate him.

Amy Mickelson (left) bonded with Tiger Woods' then-fiancee, Elin Nordegren, when both were cheering for the U.S. during the 2004 Ryder Cup at Oakland Hills Country Club in Bloomfield Township, Mich.

Phil Mickelson and wife Amy arrive at the 35th Ryder Cup Matches Gala Dinner at the Fox Theater on Sept. 15 2004 in Detroit, Mich.

Amy and Phil Mickelson were in attendance at Continental Airlines Arena on June 9, 2002 when the Los Angeles Lakers took on the New Jersey Nets in Game 3 of the 2002 NBA Finals.

Amanda Mickelson, Jim McKay and Phil, Amy and Sophia Mickelson pose with the trophy during the Bob Hope Chrysler Classic at PGA West in La Quinta, Cali.

Phil Mickelson hugs Amy Mickelson at the NEC World Series of Golf at the Firestone Country Club in Akron, Ohio.

Amanda Brynn, the first child of Phil and Amy Mickelson, was born June 21, 1999, one day after Phil finished second at the U.S. Open.