But instead of being distracted by the bright lights, Tomic knuckled down and Troicki was impressed by the 23-year-old's dedication and work ethic, both of which have been criticised throughout his career.

"Belgrade is really famous for night life and I thought Bernie was going to go out every night," Troicki said.

"No. He was quiet and he didn't want to go anywhere. He was tired every day and went to early to sleep, which is a great thing for him."

As recently as last week, Australian coach Roger Rasheed lashed Tomic's languid style on the court, suggesting he either started showing passion or give the game away entirely.

Troicki said anyone with doubts about Tomic's passion should have watched him this past week.