Phil Mickelson had 3 tournament wins in 2008-09.

phil mickelson wins in 2009
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NAMESEASONEVENTSWINSTOP 10SCORING AVGROUNDSGIR%FWY%DRIVING DISTANCE AVGPUTTING AVGSAND SAVE%SCRAMBLING %FEDEXCUP POINTSMONEY
Phil MickelsonPhil Mickelson2008-09663770.26764.352.2300.11.846.657.52,920$5,332,755
StatMuse has season-level data for tournament wins going back to the 1979-80 season.