Jordan Spieth had the best scoring average in 2014-15, with 68.9 strokes per round.

best scoring average 2015
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2014-15Spieth2014-15Day2014-15Watson2014-15McIlroy2014-15Stenson2014-15Affrunti2014-15Johnson2014-15Rose2014-15Johnson2014-15Wilcox2014-15Casey2014-15Furyk2014-15Koepka2014-15Matsuyama2014-15Garcia2014-15Taylor2014-15Kuchar2014-15Palmer2014-15Thomas2014-15Na2014-15Streb2014-15Snedeker68.969.269.369.369.469.669.669.769.869.869.869.869.969.970707070.170.170.170.170.2
NAMESEASONEVENTSSCORING AVGTOP 10WINSROUNDSGIR%FWY%DRIVING DISTANCE AVGPUTTING AVGSAND SAVE%SCRAMBLING %FEDEXCUP POINTSMONEY
Jordan SpiethJordan Spieth2014-152568.91558867.962.9291.81.758.165.03,800$12,030,465
Jason DayJason Day2014-152069.21157270.855.9313.71.761.165.32,290$9,403,330
Bubba WatsonBubba Watson2014-151969.31026869.356.6315.21.846.961.91,680$6,876,797
Rory McIlroyRory McIlroy2014-151269.3724271.067.730458.5602$4,863,312
Henrik StensonHenrik Stenson2014-151669.4806073.569.9296.41.849.462.22,307$4,755,070
Joe AffruntiJoe Affrunti2014-15469.6001270.174.3274.958.139$31,480
Dustin JohnsonDustin Johnson2014-152169.61117267.155.5317.71.738.657.91,360$5,509,467
Justin RoseJustin Rose2014-152069.7816670.563.9303.51.760.859.11,235$5,462,677
Zach JohnsonZach Johnson2014-152569.81018768.671.2282.61.756.361.01,450$4,801,487
Willy WilcoxWilly Wilcox2014-151769.8405872.569.0296.61.863.162.6649$1,168,302
Paul CaseyPaul Casey2014-152469.8808272.464.2297.81.838.556.1632$3,488,311
Jim FurykJim Furyk2014-151969.8716469.869.1281.91.844.662.9304$3,732,664
Brooks KoepkaBrooks Koepka2014-152369.9818169.557.3308.21.853.756.6414$3,571,900
Hideki MatsuyamaHideki Matsuyama2014-152569.9909169.265.3294.51.748.861.9558$3,758,619
Sergio GarciaSergio Garcia2014-151570405667.659.53001.745.658.41,177$2,670,229
Vaughn TaylorVaughn Taylor2014-151270204670.067.8286.159.9361$533,036
Matt KucharMatt Kuchar2014-152570709466.663.2288.51.761.563.8530$2,774,170
Ryan PalmerRyan Palmer2014-152270.1507766.856.6305.21.849.260.61,386$1,974,523
Justin ThomasJustin Thomas2014-153070.17010668.958.2303.21.749.661.61,498$2,278,564
Kevin NaKevin Na2014-152770.1709564.662.5280.11.763.262.9410$2,820,766
Robert StrebRobert Streb2014-153070.19111069.159.5297.11.852.559.6542$3,947,424
Brandt SnedekerBrandt Snedeker2014-152770.2819565.061.0288.41.759.063.3416$3,698,056
Louis OosthuizenLouis Oosthuizen2014-152070.2606368.359.8298.81.860.861.3176$3,251,174
Rickie FowlerRickie Fowler2014-152170.2727265.862.1296.81.755.861.11,838$5,773,430
Harris EnglishHarris English2014-152970.23010267.158.5298.41.847.961.7360$1,971,687
StatMuse has season-level data for scoring average going back to the 1979-80 season.