Lonzo Ball has averaged the most career assists per game by a 19-year-old player, with 9.0 per game.

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most assists per game by a player 19 years old or younger
BallMarburyJamesBallMudiayGiddeyDoncicIrvingHayesLivingstonSmithParkerHolidayFultzFoxGarlandMaledonRussellTelfairNtilikinaLaVineEdwardsJonesAnthonyWagner9.07.46.36.15.85.85.75.75.35.04.44.33.83.83.73.63.53.43.33.23.02.92.92.82.8
NAMEGPAPGMPGPPGRPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Lonzo BallLonzo Ball49.035.711.59.01.00.53.04.514.331.61.35.522.71.32.355.614346363642129-24
Stephon MarburyStephon Marbury387.432.715.62.51.00.33.15.313.140.31.64.435.33.44.773.61,24459295280371011989-141
LeBron JamesLeBron James776.339.722.65.82.00.83.28.419.243.90.82.530.75.06.675.13,0601,73745048515360246146+56
LaMelo BallLaMelo Ball516.128.815.75.91.60.42.85.713.243.61.85.135.22.53.275.81,4698033023138118145136-84
Emmanuel MudiayEmmanuel Mudiay485.830.211.63.31.10.63.44.312.534.80.82.928.12.13.364.31,4525561582795328163100-75
Josh GiddeyJosh Giddey205.829.410.47.21.00.72.84.311.039.10.93.525.70.91.365.458720714311620135535-152
Luka DoncicLuka Doncic575.732.220.97.31.00.33.46.915.943.42.57.035.34.76.572.61,8371,1944153245716194107-16
Kyrie IrvingKyrie Irving405.731.319.03.81.00.53.17.014.847.41.33.340.53.74.287.01,253760153227401812595-70
Killian HayesKillian Hayes265.325.86.82.71.00.43.22.77.735.30.82.827.80.50.782.46701766913827108357-130
Shaun LivingstonShaun Livingston305.027.17.43.01.10.42.53.07.241.40.00.10.01.52.074.68142228915132117582-17
Dennis Smith Jr.Dennis Smith Jr.174.428.514.34.20.90.43.25.614.937.91.55.129.91.52.265.848524372741665433-100
Tony ParkerTony Parker774.329.49.22.61.20.12.03.58.341.90.82.532.31.42.167.52,267705197334897151166+177
Jrue HolidayJrue Holiday733.824.28.02.61.10.22.13.27.144.20.82.239.00.91.275.61,7675871912807918156153-161
Markelle FultzMarkelle Fultz143.818.17.13.10.90.31.23.27.940.50.00.10.00.71.547.625310043531241722+18
De'Aaron FoxDe'Aaron Fox293.725.19.42.80.90.22.23.89.540.20.41.328.91.42.166.7729273811082576564-184
Darius GarlandDarius Garland463.630.212.31.90.80.02.74.611.739.41.95.335.51.21.487.31,3895678916435012370-262
Theo MaledonTheo Maledon653.527.310.13.20.90.22.23.59.436.81.64.833.51.62.174.81,7786582112275611141126-621
D'Angelo RussellD'Angelo Russell563.427.212.13.61.10.22.44.711.241.81.54.534.31.31.870.71,52367819918964913493-289
Sebastian TelfairSebastian Telfair683.319.66.81.50.50.11.82.56.339.30.31.024.61.52.078.91,330460104224354125120-190
Frank NtilikinaFrank Ntilikina783.221.95.92.30.80.21.72.36.436.40.62.031.80.60.972.11,7054631772506518131181-101
Zach LaVineZach LaVine573.020.47.42.10.70.12.12.96.941.70.41.429.31.31.681.31,162424121170427117111-367
Anthony EdwardsAnthony Edwards722.932.119.34.71.10.52.27.016.841.72.47.232.92.93.877.62,3141,3923362118236160129-228
Tyus JonesTyus Jones372.915.54.21.30.80.10.91.54.235.90.41.430.20.81.171.8573156471083133333-135
Carmelo AnthonyCarmelo Anthony822.836.521.06.11.20.53.07.617.942.60.82.632.25.06.477.72,9951,7254982279741247225+65
Dajuan WagnerDajuan Wagner332.831.014.51.61.00.21.95.214.036.81.44.331.92.83.677.51,02447852913356381-151
StatMuse has game-level data for assists per game going back to the 1982-83 season.