They debuted publicly together when they attended Glamour on the Grid, the launch party for the Australian Grand Prix last March and were later spotted on a double date with Kyrgios and Costeen Hatzi .
But the couple seem to have now officially separated.
Speaking during their relationship, Hannah opened up on the challenges of dating a travelling tennis player.
She told the Herald Sun: “We just had a nice month together and I already miss him – long distance is really hard.
“Thanasi is really dedicated to his tennis and he’s putting everything into it and I’m so proud of him.”
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Kokkinakis revealed Hannah – who runs a designer clothing hire company called Styled By Mim – was his “first girlfriend, probably ever” and joked he was a “late bloomer”.
Dal Sasso, though, was determined not to be labelled a Wag during their relationship – and wanted to have her own recognition.
Tennis stars following in parents' footsteps
TALK about pressure…
These rising stars are all making their way in tennis.
But they have got something in common – they’ve got a famous parent who also made their name in the sport.
So who are the players hoping to follow in the footsteps of their tennis mums and dads?
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