Nick Kyrgios is not one to stay out of the limelight for long.The 23-year-old Australian has always been one of the most controversial players on tour since his introduction onto the circuit, whether it's for swearing, tanking or arguing with journalists.Just yesterday Kyrgios told a journalist "I don't care" when his various f-bombs during his defeat of British star Kyle Edmund at Queens were picked up by microphones positioned around the court.What can't be argued though is that he thrives on-court when it comes to the grass surface season, with his joint-best finish at a Grand Slam coming at the quarter-final stage at Wimbledon in 2014.Who will ever forget the year in-question when he produced this stunning between-the-legs winner against Rafael Nadal to leave spectators with their jaws dropped.That version of Kyrgios would run the big-guns of the sport close in every Grand Slam, but the Kyrgios we saw parts of earlier today will probably not do so well in the upcoming Slams.After taking the first set 7-6 after a tiebreak against Feliciano Lopez in the last eight of the Queens Club Championship, Kyrgios decided to do something strange as Lopez was serving to make it 4-3 in the second set.

What on earth is he doing?

Despite the fact he went on to win the set 7-6, and the match, there's every chance Kyrgios could be reprimanded for making no attempt to return the Argentinian's serve.

Even though he smashed 32 aces on his way to victory, the talk will seemingly always be on the negatives of the Aussie's game if he continues to act unprofessionally on the court.

Kyrgios though secured a semi-final clash with number one seed Marin Cilic, which will be a true test of where he's at after returning from injury two weeks ago in Stuttgart, where he fell to Roger Federer.

And who knows, a solid performance, or even a win against Cilic could do wonders for his chances at this year's Wimbledon, which gets underway on July 2.