Bobby Fischer played a lot of Blitz, notably:

* 1958 trip to Moscow chess club he took on all comers, including Petrosian in blitz: https://nezhmet.wordpress.com/2010/03/18/the-fabulous-50s-fi...

* 1962 Stockholm, Geller pulls a trick on Fischer suggesting he play his "unknown" compatriot when Fischer challenged him to blitz. The unknown was Leonid Stein, a legendary blitz player, but largely unknown outside of the USSR: http://www.thechessdrum.net/blog/2012/03/16/bobbys-blitz-che...

* 1970 Herceg Novi Blitz tournament, held very soon after The World vs USSR match. Winner was a certain Bobby Fischer: https://www.365chess.com/tournaments/Herceg_Novi_blitz_1970