Englishman Dan Evans revealed a snub from the father of Bernard Tomic was the motivation behind his upset victory over the combative Australian in the second round of the US Open on Thursday.

The world No 179 eliminated Tomic 1-6, 6-3, 7-6 (4), 6-3 before recalling the time John Tomic, who is banned from the ATP Tour because of an assault charge against him in Spain, told him he was not good enough to train with his son.

"It was quite funny, actually," Evans said.