Phil Mickelson had 4 tournament wins in 2004-05.

phil mickelson wins in 2005
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NAMESEASONEVENTSWINSTOP 10SCORING AVGROUNDSGIR%FWY%DRIVING DISTANCE AVGPUTTING AVGSAND SAVE%SCRAMBLING %FEDEXCUP POINTSMONEY
Phil MickelsonPhil Mickelson2004-05814969.47866.958.73001.757.362.4$5,699,605
StatMuse has season-level data for tournament wins going back to the 1979-80 season.