Larry Bird had a defensive rating of 102.7 in the 1986 NBA Finals.

larry bird ortg drtg 1986 finals
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NAMESEASONSERIESTMGPDRTGORTGMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Larry BirdLarry Bird1985-86NBA FinalsBOSBOS6102.7124.044.824.09.79.52.70.32.78.818.348.21.23.236.85.25.593.926914458571621617
StatMuse has game-level data for offensive rating going back to the 1978 Finals.