Andrew Bogut had a defensive rating of 98.7 in the 2016 playoffs.

bogut drtg 2016 playoffs
NAMESEASONTMGPDRTGMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Andrew BogutAndrew Bogut2015-16GSWGSW2298.716.64.65.71.40.61.60.92.23.562.30.00.10.00.20.635.73651011253014351972+34
StatMuse has season-level data for defensive rating going back to the 1974 playoffs.