Tired Nick Kyrgios and his girlfriend Costeen Hatzi walk hand-in-hand through Sydney airport

Keeping you up Nick? A very tired Kyrgios and his girlfriend Costeen Hatzi walk hand-in-hand through Sydney airport after a trip abroad

A very tired Nick Kyrgios and his girlfriend Costeen Hatzi looked relieved to be back in Australia on Tuesday.

The loved-up couple were spotted strolling through Sydney International Airport as they returned from a trip abroad. 

The 27-year-old tennis champion appeared to be suffering from jet lag as he could not stop yawning as he made his way through the arrivals lounge.

A very tired Nick Kyrgios and his girlfriend Costeen Hatzi (pictured together) looked relieved to be back in Sydney on Tuesday following a trip abroad 

The lovebirds rocked a smart-casual look, with Nick clad head-to-toe in black activewear, including a jumper, tracksuit pants and sneakers.

His girlfriend Costeen, 22, also put on a stylish display in an unbuttoned blue blouse, black leggings and sneakers.

She added a touch of sophistication to her casual look with a $5000 Christian Dior tote bag and a Rolex wristwatch.

The 27-year-old tennis champion appeared to be suffering from jet lag as he could not stop yawning as he made his way through the arrivals lounge

The 27-year-old tennis champion appeared to be suffering from jet lag as he could not stop yawning as he made his way through the arrivals lounge

The pair walked hand-in-hand through the airport and were seen leaving in a private car.

The lovebirds have been dating for about nine months after confirming their romance in December last year.

All eyes have been on Nick and Costeen in recent months as rumours swirl the pair will soon announce an engagement.

Nick rocked a smart-casual look and was clad head-to-toe in black activewear, including a jumper, tracksuit pants and sneakers

Nick rocked a smart-casual look and was clad head-to-toe in black activewear, including a jumper, tracksuit pants and sneakers

He recently posted a romantic photo of the couple on Instagram, alongside the gushing caption: ‘Dear, Coz. What a journey we have been on already.’ 

‘My life has honestly never been the same since I’ve met you. You continue to make me smile and be everything I need in tough moments,’ he added.

‘There will always be struggle in life and I only ever want to ride the ups and downs with you.

Nick announced in July he and Costeen would be trying for their first baby next year.

Costeen also put on a stylish display in an unbuttoned blue blouse and black leggings and added a touch of sophistication with a $5000 Christian Dior tote bag

Costeen also put on a stylish display in an unbuttoned blue blouse and black leggings and added a touch of sophistication with a $5000 Christian Dior tote bag

The pair were seen getting into a private vehicle which was waiting for them

The pair were seen getting into a private vehicle which was waiting for them

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