He lost completely in his final WOW TBC Gold battle against Thrall. He was losing his duel with Varian and also in a duel against Cairne. The first fight was a loss that was cut short, and he won the second unfairly.
They had three fights and they were all interrupted. In their third fight in Wolfheart, Varian only gains an advantage because his blessing cheap WOW Classic TBC Gold by Lo'Gash and has unbeatable endurance. Both are equally skilled when they face off during the tides of War.