Mike Gminski and Otis Birdsong were tied for the worst winning percentage in the playoffs when playing 30+ games, winning 28.6 percent of the time.

lowest playoff win percentage by a player with 30 games played
Interpreted as:
lowest playoff win percentage by a player with 30 or more games played
GminskiBirdsongPadgettDunleavyMcCollumEllisEllisHumphriesMilesFeltonBlakeBrownCalderonJamisonTempleYoungGreenAtkinsCurryBlaylockLongFloydCookWashingtonAnthony.286.286.300.313.316.316.316.317.318.319.321.323.325.326.333.333.333.333.333.333.333.333.333.333.337
NAMEGPW%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Mike GminskiMike Gminski35.28626.211.25.50.80.61.61.44.28.748.50.00.10.02.83.579.59173931932922574872
Otis BirdsongOtis Birdsong35.28631.115.63.03.01.60.12.06.613.848.00.00.49.12.34.058.31,0905461041045657189
Scott PadgettScott Padgett30.3009.72.82.20.50.30.20.61.12.640.50.41.231.40.30.472.72918365151061844-16
Mike DunleavyMike Dunleavy32.31324.08.82.91.90.60.20.93.06.248.01.63.545.11.31.684.076828393612063049+33
CJ McCollumCJ McCollum57.31635.120.04.22.80.80.41.97.717.543.92.25.838.42.53.277.31,9981,1402381574625108135-165
Monta EllisMonta Ellis38.31629.913.72.83.01.50.22.35.312.442.70.93.229.82.22.975.51,1375211061135688690-146
Joe EllisJoe Ellis38.31615.15.33.40.62.27.130.70.91.469.25752021312375
Jay HumphriesJay Humphries41.31726.99.72.34.60.80.11.43.77.946.70.41.426.81.92.578.21,1043969318732557123
CJ MilesCJ Miles44.31818.87.32.11.00.50.30.92.56.240.71.03.331.51.31.584.88253239342201238100-124
Raymond FeltonRaymond Felton47.31925.79.42.53.11.00.21.23.78.842.00.72.332.11.31.871.11,2074411161464885883-123
Steve BlakeSteve Blake53.32120.54.62.02.50.50.11.01.74.239.81.02.538.80.30.470.01,0852421041342565372-176
Dee BrownDee Brown31.32325.210.32.83.60.70.51.43.98.844.90.51.829.11.92.385.77823208811223154479+3
Jose CalderonJose Calderon40.32516.26.51.43.10.40.00.92.75.845.90.82.237.20.30.492.9646259561251513767+16
Antawn JamisonAntawn Jamison46.32634.917.27.21.30.80.71.56.614.744.81.33.834.12.73.870.61,60679133058363370139-50
Garrett TempleGarrett Temple30.3338.32.60.80.40.30.10.50.82.433.80.41.724.00.60.872.0250782313921430-72
Thaddeus YoungThaddeus Young51.33329.210.26.11.61.20.41.34.49.446.70.20.826.81.32.161.91,49052231282602066120-199
Willie GreenWillie Green36.33315.05.21.30.90.30.10.62.14.941.80.31.225.60.81.171.153918646321252260-148
Chucky AtkinsChucky Atkins36.33323.58.61.72.40.80.01.33.07.937.41.13.135.51.61.980.084530962872814681-111
Michael CurryMichael Curry36.33319.04.31.11.00.40.10.41.73.548.00.20.733.30.70.977.468315441361551486-48
Mookie BlaylockMookie Blaylock54.33340.014.24.96.62.10.43.05.214.037.02.36.635.01.62.368.32,16176926635711624162102+1
Grant LongGrant Long42.33328.18.95.81.41.00.21.63.17.641.10.20.820.02.43.275.61,18037324359411066104-24
Sleepy FloydSleepy Floyd36.33328.813.02.16.11.20.12.64.810.445.70.81.941.42.73.381.41,038467772194359258
Jeff CookJeff Cook30.33315.65.63.71.00.40.30.81.83.650.90.00.150.01.92.575.74681671113112102371
Jim WashingtonJim Washington42.33326.38.87.11.40.00.03.68.144.41.62.759.81,1063693005800111
Carmelo AnthonyCarmelo Anthony83.33737.323.16.72.51.20.32.68.119.441.41.23.832.45.76.982.63,0921,91455720410029218298-288