New York: Dominic Thiem recorded one of the best and one of the worst victories of his life in the second round of the US Open on Friday.

Dominic Thiem
Dominic Thiem 

The 20-year-old Austrian is among the most exciting young talents around and he made the last 32 at a Grand Slam for the first time by coming from two sets down to defeat 11th seed Ernests Gulbis 4-6 3-6 6-4 6-3 6-3.

But it was not a match he enjoyed because Gulbis is his training partner and mentor.

The pair share a coach in Gunter Bresnik and travel the world together. They even warmed up together before Friday's match, but that was all that was normal about it.

"I hated the situation," said Thiem. "It's something really, special, it's a great win for me. But I would prefer it against anybody else."