Ambitious Marin Cilic has Roger Federer and Rafael Nadal in his sights

Marin Cilic says he believes he can threaten Roger Federer and Rafael Nadal in the world rankings after a strong start to 2018.

The Croatian reached the Australian Open final in January, losing to Federer in five sets.

However, with Novak Djokovic and Andy Murray struggling for court-time this year due to injury concerns, Cilic is hearing the sound of opportunity knocking, and he is determined to answer it.

“I started great this season, opened it the best ever with the final at the Australian Open,” Cilic told the ATP.

“That perspective just gives my mind a good and stable strategy for moving forward in 2018.

“I didn’t finish 2017 the way I wanted.

“Obviously I finished at No 6, which is still amazing, second year in a row.

“But still I want to push myself to be improving and getting better and obviously that means getting higher in the rankings.

“Hopefully this season can give me a lot of great results and hopefully another Grand Slam title as well.”