Philip Alfred Mickelson (born June 16, 1970), nicknamed Lefty, is an American professional golfer. He has won 43 events on the PGA Tour, including five major championships: three Masters titles (2004, 2006, 2010), a PGA Championship (2005), and an Open Championship (2013). Mickelson is one of 16 players in the history of golf to win at least three of the four majors. He has won every major except the U.S. Open, where he has finished runner-up a record six times.

Mickelson's first major championship win came in his thirteenth year on the PGA Tour in 2004, when he secured victory in the Masters with an 18-foot (5.5 m) birdie putt on the final hole. Ernie Els was the runner-up at a stroke back; the two played in different pairs in the final round and had traded birdies and eagles on the back nine. In addition to getting the "majors monkey" off his back, Mickelson was now only the third golfer with a left-handed swing to win a major, the others being New Zealander Sir Bob Charles, who won The Open Championship in 1963, and Canadian Mike Weir, who won The Masters in 2003. (Like Mickelson, Weir is a right-hander who plays left-handed.) A fourth left-handed winner is natural southpaw Bubba Watson, the Masters champion in 2012 and 2014.  Just prior to the Ryder Cup in 2004, Mickelson was dropped from his long-standing contract with Titleist/Acushnet Golf, when he took heat for a voicemail message he left for a Callaway Golf executive. In it he praised their driver and golf ball, and thanked them for their help in getting some equipment for his brother. This memo was played to all of their salesmen, and eventually found its way back to Titleist. He was then let out of his multi-year deal with Titleist 16 months early, and signed on with Callaway Golf, his current equipment sponsor. He endured a great deal of ridicule and scrutiny from the press and fellow Ryder Cup members for his equipment change so close to the Ryder Cup matches. He faltered at the 2004 Ryder Cup with a 1-3-0 record, but refused to blame the sudden change in equipment or his practice methods for his performance.  In November 2004, Mickelson tallied his career-low for an 18-hole round: a 59 at the PGA Grand Slam of Golf at Poipu Bay Golf Course in Hawaii.  The following year, Mickelson captured his second major at the PGA Championship at Baltusrol, in a Monday final-round conclusion that had been forced by inclement weather the previous day. On the 18th hole, Mickelson hit one of his trademark soft pitches from deep greenside rough to within a 18 inches (460 mm) of the cup, and made his birdie to finish at a 4-under-par total of 276, one shot ahead of Steve Elkington and Thomas Bjorn.  Mickelson captured his third major title the following spring at the Masters. He won his second green jacket after shooting a 3-under-par final round, winning by two strokes over runner-up Tim Clark. This win propelled him to 2nd place in the Official World Golf Ranking (his career best), behind Woods, and ahead of Vijay Singh and Retief Goosen.

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