US star Phil Mickelson won his third Masters title and fourth major crown in dramatic fashion on Sunday while Tiger Woods could only ponder his mistakes and wonder what might have been. Mickelson shot a bogey-free five-under par 67 to finish 72 holes on 16-under 272, defeating England's Lee Westwood by three strokes, in an emotional victory for wife Amy, who has been battling breast cancer for nearly a year."It has been an emotional year," Mickelson said. "I'm very proud of the fight and struggle she has been through. It has been very difficult and very emotional. To be on the other end and feel the jubilation is incredible."Mickelson made a tearful embrace with Amy behind the 18th