Chris Jericho called Goldberg and Undertaker "once in a lifetime."
1 / 7
Goldberg's bout with Undertaker was widely criticized by fans.
2 / 7
Goldberg suffered a concussion during the match.
3 / 7
Undertaker returned to the ring for the first time since November.
4 / 7
Ric Flair also offered praise for both Goldberg and Undertaker.
5 / 7
The two men botched a handful of moves throughout the frustrating match.
6 / 7