Yes. The last game of the 2003 finals Timmy famously had a line of 21-20-10-8:
http://www.basketball-reference.com/...306150SAS.html
Personally though, while that stat line is the most memorable for being (a) incredible and (b) a championship-clinching effort, I think Duncan's most impressive stat line ever was from game 1 of that series. (
http://www.basketball-reference.com/...306040SAS.html) 32 points, 20 rebounds, 6 assists, 7 blocks, and 3 steals. More importantly, he did it with a 0.691 TS%, whereas in the famous last game his TS% was only 0.495.
32-20-6-7-3 with a true shooting of 69.1% is basically enough to win a game singlehandedly. And he did it in the finals. That's my favorite Duncan stat line ever.