Carlos Alcaraz said he will "for sure" get a kangaroo tattoo if he wins the Australian Open, the only Grand Slam title missing from his already illustrious career.

The Spaniard overcame Portugal's Nuno Borges 6-2 6-4 6-7 (3-7) 6-2 to progress to the fourth round, where he could meet British number one Jack Draper.

The 21-year-old is bidding to become the youngest man to complete the career Grand Slam.

"I will get a kangaroo [tattoo] for sure, that's my idea. The only thing missing is to lift the trophy here but it's definitely the plan if it happens," he said.

Alcaraz already has tattoos of the date of his 2022 US Open win, the Eiffel Tower to represent his 2024 French Open triumph and a strawberry to represent his two Wimbledon titles.

The third seed has never made it past the quarter-final stage in Melbourne but looked in fine tune on Friday as he showcased his signature energetic and dynamic tennis.

"I'm really happy to play here again. I tried to show my best tennis on a beautiful court and the last time I played here I lost so I wanted to play here and win," he said.

"It's a privilege to feel this love. I try to play different tennis, show the shots that I enjoy doing and show my good tennis and try to entertain the people as well and make them happy."