Mark West had the highest winning percentage with the Suns when playing 500+ games, winning 66.7 percent of the time.

which player has the highest winning percentage ever in phoenix suns history with a minimum of 500 games played
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WestMajerleJohnsonNashStoudemireMarionScottBarbosaDavisAdamsVan Arsdale.667.661.652.638.632.611.596.590.544.527.439
NAMEGPW%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Mark WestMark West543.66721.46.96.00.40.31.71.22.74.561.30.00.00.01.42.460.111,6473,7613,2412311888976521,642-6
Dan MajerleDan Majerle595.66132.613.54.73.11.40.41.35.011.244.31.33.736.42.33.074.119,4098,0342,8231,8248112587561,228+62
Kevin JohnsonKevin Johnson683.65235.218.73.49.51.50.23.26.413.049.40.20.830.75.66.784.124,01812,7472,3326,5181,0221592,1761,445+348
Steve NashSteve Nash744.63830.614.43.19.40.70.13.15.310.550.41.43.243.52.42.790.722,78110,7122,2936,997511672,3011,079+3539
Amar'e StoudemireAmar'e Stoudemire516.63234.321.48.91.30.91.42.67.714.254.40.00.219.05.97.875.817,68611,0354,6136774477221,3251,772+1786
Shawn MarionShawn Marion660.61137.818.410.02.01.91.41.67.415.448.11.02.934.22.63.282.424,94812,1346,6161,3321,2458941,0501,704+2184
Alvin ScottAlvin Scott627.59617.34.93.21.40.60.61.01.93.948.10.00.020.01.21.673.310,8533,0881,9928474043716171,034
Leandro BarbosaLeandro Barbosa553.59023.611.72.22.40.90.21.44.39.346.41.43.439.41.61.982.913,0356,4431,2391,321485847651,159+634
Walter DavisWalter Davis766.54430.220.53.24.41.40.22.88.516.352.00.20.728.03.34.084.123,14315,6662,4723,3401,0401152,1741,888
Alvan AdamsAlvan Adams988.52727.514.17.04.11.30.82.65.811.649.80.00.013.32.53.278.827,20313,9106,9374,0121,2898082,1943,214
Dick Van ArsdaleDick Van Arsdale685.43935.417.63.63.50.90.26.313.447.15.06.181.324,24212,0602,4522,399264441,851