Duje Markovina is a 17-year-old tennis player, born and raised in Split, Croatia, who represents Australia on the professional tennis tour.

A highly-rated prospect on the ITF junior tour, Duje was the male recipient of the Drazen Petrovic Award in 2022 in Croatia and was named the Croatian junior tennis athlete of the year in 2024.

The left-hander is a member of Tennis Australia's National Academy, training and living in Brisbane. 

Duje made his junior grand slam debut at the 2025 Australian Open, where he claimed his maiden junior grand slam win in the first round.

Off the court, Duje enjoys watching football and spending time with his friends and family.