Rory McIlroy had the lowest scoring average in 2018-19, with 69.1 strokes per round.

list of players best scoring average in 2019
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2018-19McIlroy2018-19Cantlay2018-19Simpson2018-19Koepka2018-19Thomas2018-19Morikawa2018-19Rahm2018-19Scott2018-19Fleetwood2018-19Casey2018-19Rose2018-19Schauffele2018-19Matsuyama2018-19Johnson2018-19Kuchar2018-19Fowler2018-19Finau2018-19Wolff2018-19Glover2018-19Stenson2018-19Furyk2018-19DeChambeau69.169.369.469.469.569.569.669.769.769.869.869.869.869.969.9707070.170.170.170.170.2
NAMESEASONEVENTSSCORING AVGTOP 10WINSROUNDSGIR%FWY%DRIVING DISTANCE AVGPUTTING AVGSAND SAVE%SCRAMBLING %FEDEXCUP POINTSMONEY
Rory McIlroyRory McIlroy2018-191969.11436868.661.8313.51.755.363.42,842$7,785,286
Patrick CantlayPatrick Cantlay2018-192169.3917667.257.3304.71.758.066.13,157$6,121,488
Webb SimpsonWebb Simpson2018-192169.4607865.866.8288.61.763.066.91,946$4,690,572
Brooks KoepkaBrooks Koepka2018-192169.4937470.061.83091.858.462.33,119$9,684,006
Justin ThomasJustin Thomas2018-192069.5717670.760.0302.21.752.661.33,475$5,013,084
Collin MorikawaCollin Morikawa2018-19969.5313671.972.1296.51.745.860.5840$1,754,890
Jon RahmJon Rahm2018-192069.61217269.062.5305.61.752.859.62,517$4,990,110
Adam ScottAdam Scott2018-191869.7906168.959.9299.31.755.559.81,874$4,084,541
Tommy FleetwoodTommy Fleetwood2018-191869.7606466.964.0298.71.863.568.01,479$3,853,651
Paul CaseyPaul Casey2018-192269.8717571.067.7298.41.743.758.71,768$4,257,040
Justin RoseJustin Rose2018-191769.8716664.860.1303.21.761.762.11,739$4,358,849
Xander SchauffeleXander Schauffele2018-192169.8627868.460.3304.11.755.762.22,030$5,609,456
Hideki MatsuyamaHideki Matsuyama2018-192469.8709269.461.33031.853.764.11,821$3,335,137
Dustin JohnsonDustin Johnson2018-191969.9717467.055.63121.763.957.91,840$5,534,619
Matt KucharMatt Kuchar2018-192269.9828069.467.4289.51.760.863.02,339$6,294,690
Rickie FowlerRickie Fowler2018-192070618067.860.6303.11.754.860.81,637$3,945,810
Tony FinauTony Finau2018-192570608867.556.9309.51.849.462.21,911$4,344,380
Matthew WolffMatthew Wolff2018-19870.1112967.659.9309.11.735.356.8613$1,390,433
Lucas GloverLucas Glover2018-192670.1709068.266.1296.11.859.164.71,337$2,613,965
Henrik StensonHenrik Stenson2018-191570.1305466.172.1282.71.849.362.3523$1,397,370
Jim FurykJim Furyk2018-192170.1306869.374.52751.853.464.1911$2,669,938
Bryson DeChambeauBryson DeChambeau2018-192170.2517666.265.0302.51.752.362.31,371$3,186,232
Patrick ReedPatrick Reed2018-192570.2519266.260.1296.81.758.863.02,946$3,593,844
Jason DayJason Day2018-192170.2606869.761.83021.752.459.6897$2,637,480
Gary WoodlandGary Woodland2018-192470.2818869.163.4308.21.850.457.51,912$5,690,965
StatMuse has season-level data for scoring average going back to the 1979-80 season.