Rory McIlroy had his best scoring average in 2019-20, with 69.2 strokes per round.

rory mcliroy best scoring average last season
NAMESEASONEVENTSSCORING AVGTOP 10WINSROUNDSGIR%FWY%DRIVING DISTANCE AVGPUTTING AVGSAND SAVE%SCRAMBLING %FEDEXCUP POINTSMONEY
Rory McIlroyRory McIlroy2019-201569.2715767.856.33141.745.260.61,516$4,408,415
StatMuse has season-level data for scoring average going back to the 1979-80 season.

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