UFC middleweight champion Luke Rockhold has been after Anderson Silva for years.
Unfortunately both men had 2013's they would rather forget. Rockhold was knocked out by Vitor Belfort that May in his UFC debut while Silva suffered his own KO at the hands of Chris Weidman at UFC 162 in July.
Rockhold hasn't lost since and captured the middleweight strap in dominant fashion when he TKO'd Weidman in December at UFC 194. Rockhold is still very interested in Silva, but believes the "GOAT" has some work to do coming off a one-year suspension for performance enhancing drugs.