The world No1 won his 22nd title at the Vienna Open over the weekend and he thanked his girlfriend for her support in his victory speech.
Danish model Laila Hasanovic was spotted on celeb dating app Raya this year
Sinner was previously linked to Brooks Nader
Sinner, 24, beat Alexander Zverev 3-6 6-3 7-5 in the final and afterwards admitted he is not always easy to deal with.
Laila watched on from the crowd sitting next to his parents, Siglinde and Johann
Sinner showed his appreciation to them, saying after the win: "Thank you so much for the support.
"The work you put in, the effort. Also, to understand me at times, it is not easy, but thank you for putting in the effort.
"Everyone here, with family, my girlfriend, friends.
"To my whole team and also those watching at home. Thank you so much for the support."
Laila, 24, was previously in a relationship with former Formula 1 star Mick Schumacher, son of Michael.
They dated for around three years before splitting in April.
The Miss Universe finalist was brought into the family's "inner circle" – and was Mick's only girlfriend to have visited his F1 legend father.
Sinner previously revealed in May that he was not dating, but he was later linked to model Brooks Nader.
Rumours swirled Brooks was at the centre of a love triangle between Sinner and his rival Carlos Alcaraz at the US Open.
Sinner never publicly revealed he was dating Nader
