They previously dated briefly way back in 2011.

But it appears Serena Williams and Drake have rekindled their romance, after the two were spotted making out at a trendy Cincinnati restaurant on Sunday, just hours after she won the Women's Tennis Association tournament.

The 33-year-old tennis superstar sat on the 28-year-old rapper's lap in a private room of the high-priced Sotto eatery downtown in the city.

Scroll down for video

Rekindled romance? Serena Williams and Drake were spotted 'making out' at Sotto restaurant in downtown Cincinnati on Sunday

In one of the fan-taken snapshots, Serena appears to be sitting very closely to Drake as she whispers in his ear.

An onlooker told TMZ the pair 'could not keep their hands and lips off of each other.'

Serena showed off her toned arms and ample cleavage in a white tank top with exposed color coordinated straps.

She wore her voluminous hair in a ponytail with her neck and shoulders clearly defined.

Meanwhile, Drake dressed comfortably in a grey hoodie and black jacket with dark coloured jeans.

However, although the chemistry between the two was obvious, friends are warning her to approach the situation with caution to avoid getting hurt by the rapper again, according to the news site.

But sources tell TMZ their relationship 'is different this time' following their split in 2012.

Cozy and cuddling: Serena appeared to be sitting very closely to Drake as she whispered in his ear, and 'could not keep their hands and lips off of each other'

Casual: The tennis superstar showed off her toned arms and ample cleavage in a white tank top with exposed color coordinated straps

Low key: Both A-listers were dressed in casual attire for their dinner with a group of mutual friends

The Canadian hitmaker has often been pictured supporting the athlete - who dated Oscar winning rapper and Drake frenemy Common - at many of her tennis matches during their many months of dating speculation.

Back in 2011, the rumoured on-again couple were spotted kissing in the clubhouse after her victory against Victoria Azarenka in the Wimbledon quarter finals in July.

Days later, Serena once again embraced him after her press conference following her win, and was heard joking with him about being grilled on their relationship.

All smiles: Serena had a beaming grin on her face as Drake could be clearly identified with his scruffy beard and mustache

Inseparable: Serena and Drake enjoyed a previous dinner date while she was competing during the Wimbledon tournament (pictured together in July in London)

A source said: 'Publicly she says they're just friends but Drake has been by Serena's side throughout the tournament and when they've been away from the public and relaxed, it's been pretty obvious that they are together.

'Even Serena's team have been talking about it in the clubhouse to a few people they trust. She has been incredibly focused on her title bid. But if she's had a quiet moment she's spent it with Drake, even going to watch his Wireless set and having dinners in London.'

Drake was at Centre Court on the same day Serena lifted the Wimbledon trophy for the sixth time.

Supportive: The Canadian hitmaker has often been pictured supporting the athlete - who dated Oscar winning rapper and Drake frenemy Common - at many of her tennis matches during their many months of dating speculation (pictured on August 15)

Love-love: The rumoured on-again couple were spotted kissing in the clubhouse after her victory against Victoria Azarenka in the Wimbledon quarter finals in July

In the family! Drake has been a longtime friend of the Williams family seen here embracing sister Venus at Wimbledon in July

Along with a picture of the winner holding up the trophy, the Started From The Bottom hitmaker shared on Instagram: 'Showtime Champ. A big plate for all that food you ate at Wimbledon! (sic)'

Drake and Serena previously dated back in 2011, but was spotted on a date with model Dollicia Bryan in 2012.

Following their split, the tennis player said: 'I do make mistakes - like every human does. But the last relationship was too much of a heartbreak for me.'

And in 2013, Drake rapped about Serena on his single Worst Behavior which featured the lyrics: 'I'm with my whole set, tennis matches at the crib/ I swear I could beat Serena when she playin' with her left.'

A story that will never be duplicated �� A photo posted by champagnepapi (@champagnepapi) on Jul 6, 2015 at 6:42am PDT

Showtime Champ. A big plate for all that food you ate at Wimbledon! A photo posted by champagnepapi (@champagnepapi) on Jul 11, 2015 at 8:02am PDT