Serena Williams may return to the court "one more time," former world number two Tommy Haas believes.

The 23-time grand slam singles champion Williams declared her intention to "evolve" away from tennis prior to the US Open in September, with many thinking her third-round defeat to Ajla Tomljanovic signalled the end of her illustrious career.

Although, the 41-year-old hinted she may return in a recent interview with Jimmy Fallon, suggesting she may follow the example of another American sporting great.

"Tom Brady started an amazing trend," she said when asked if her competitive career may resume. "That's what I want to say."

Speaking to Eurosport Germany's tennis podcast Das Gelbe vom Ball, Haas said: "Serena had an incredible, long and strong career. 

"But I have the feeling that she is going to come back and say, 'I'm going to play one more time.' 

"She came so close to playing really well again and going far, so I think deep down it really annoys her.

"She might really be thinking about whether she wants to try again. I may be wrong because I'm not that close [to her].

"It will mostly depend on how it looks mentally, how she feels physically and whether she has the desire to torture herself like that again after achieving so much."