Here is a list of Viana's best fights. For a list of Viana's losses, refer to "Guilherme Viana Losses".
On November 20, 2015 Guilherme Viana faced off against Houston Alexander in a light-heavyweight bout at age 29. He was coming in with a record of 7-2 (7), and Alexander was 43 years old and with a record of 16-12-1 (14). Viana stopped Houston Alexander via TKO.
On April 4, 2014 Guilherme Viana faced off against Cristiano Monteiro in a light-heavyweight bout at age 27. He was coming in with a record of 5-1 (5). Viana stopped Cristiano Monteiro via submission.
On November 9, 2024 Guilherme Viana faced off against Hassan Graham in a heavyweight bout at age 38. He was coming in with a record of 9-3 (9). Viana stopped Hassan Graham via KO.
On February 24, 2024 Guilherme Viana faced off against Terrance Jean-Nacques in a light-heavyweight bout at age 37. He was coming in with a record of 8-3 (8). Viana stopped Terrance Jean-Nacques via TKO.
