Bob Gross has the highest career field-goal percentage in the NBA Finals when putting up 15.0+ points per game, at 66.7 percent.

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highest field goal percent in finals with at least 15 ppg in a series
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highest field goal percent by a player in finals with at least 15 ppg in a series
GrossAntetokounmpoO'NealDantleyDavisDumasDivacChamberlainPorterButlerKempPaulDurantCroshereMcHaleFrazierAdebayoWorthyGasolErvingAbdul-JabbarJohnsonCollinsSiakamHardaway66.761.860.257.357.157.156.555.955.855.255.155.054.654.554.453.853.553.352.852.652.351.650.550.550.0
NAMESERIESGPFG%PPGMPGRPGAPGSPGBPGTPGFGMFGA3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Bob GrossBob GrossNBA Finals666.717.327.75.73.51.80.37.711.52.02.385.7166104342111226
Giannis AntetokounmpoGiannis AntetokounmpoNBA Finals661.835.239.813.25.01.21.82.312.720.50.52.520.09.314.265.923921179307111418+30
Shaquille O'NealShaquille O'NealNBA Finals3060.228.842.313.13.40.52.13.411.318.80.00.06.212.748.41,2688653931031662101109+34
Adrian DantleyAdrian DantleyNBA Finals757.321.336.45.02.30.60.12.66.711.70.00.07.99.185.92551493516411818
Anthony DavisAnthony DavisNBA Finals657.125.038.210.73.21.32.02.79.316.31.33.242.15.05.393.822915064198121618+49
Richard DumasRichard DumasNBA Finals657.115.826.74.31.01.31.01.07.312.80.00.01.21.577.81609526686615
Vlade DivacVlade DivacNBA Finals556.518.241.68.82.01.82.43.07.813.80.00.40.02.62.6100.02089144109121518
Wilt ChamberlainWilt ChamberlainNBA Finals3555.918.647.324.63.87.513.53.59.437.71,657652862134101
Kevin PorterKevin PorterNBA Finals455.815.540.82.06.81.50.07.313.01.03.033.3163628276019
Jimmy ButlerJimmy ButlerNBA Finals655.226.243.08.39.82.20.83.08.816.00.72.230.87.88.888.72581575059135188-21
Shawn KempShawn KempNBA Finals655.123.340.310.02.21.32.04.08.214.80.00.20.07.08.285.724214060138122428
Chris PaulChris PaulNBA Finals655.021.837.32.78.20.70.23.59.216.72.03.852.21.52.075.02241311649412119-11
Kevin DurantKevin DurantNBA Finals1554.630.339.37.74.51.01.52.710.719.52.96.444.86.16.791.15894551166815234047+105
Austin CroshereAustin CroshereNBA Finals654.515.224.26.00.80.31.01.24.07.30.71.740.06.57.586.71459136526719+2
Kevin McHaleKevin McHaleNBA Finals3154.417.932.57.41.40.31.42.36.812.50.00.10.04.45.776.81,0095562304310447095
Walt FrazierWalt FrazierNBA Finals1753.818.944.67.58.27.614.13.75.172.475932112813955
Bam AdebayoBam AdebayoNBA Finals453.515.333.76.32.50.30.82.05.810.80.00.03.86.062.513561251013811-28
James WorthyJames WorthyNBA Finals3453.322.239.65.03.31.00.62.09.217.30.10.420.03.65.368.31,34675417111234206888
Pau GasolPau GasolNBA Finals1852.817.341.110.43.20.71.71.76.211.80.00.10.04.86.871.37393111885712303156+28
Julius ErvingJulius ErvingNBA Finals2252.625.539.87.54.52.01.82.89.818.70.10.414.35.87.676.687556116610044404556
Kareem Abdul-JabbarKareem Abdul-JabbarNBA Finals5652.323.537.29.13.20.92.22.79.718.60.00.00.04.15.870.02,0821,31750718145116121196
Magic JohnsonMagic JohnsonNBA Finals5051.619.440.97.911.72.00.33.86.813.10.20.823.75.76.587.42,04497139758410216190147
Doug CollinsDoug CollinsNBA Finals650.519.739.24.52.81.80.27.715.24.35.381.3235118271711117
Pascal SiakamPascal SiakamNBA Finals650.519.840.17.53.70.50.71.58.216.20.83.523.82.73.576.2241119452234911+24
Anfernee HardawayAnfernee HardawayNBA Finals450.025.543.04.88.01.00.83.88.817.52.86.045.85.35.891.31721021932431515
StatMuse has game-level data for field-goal percentage going back to the 1956 Finals.