Drake dared rap about one of Chris Brown's ex-girlfriends. Brown may retaliate by making a move on Serena Williams.

The feud between the 26-year-old Brown and 28-year-old Drake added another chapter in the aftermath of Drake's inference at Brown in lyrics from the song, "Live From the Gutter" on his What A Time To Be Alive mixtape collaboration with Future, HollywoodLife.com reports.

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Part of the song made a reference to Karrueche Tran, who dated Brown. The song line had fans speculating Drake was making a dig at Brown.

A source close to Brown warned Drake about payback.

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"All the dudes envy Chris for getting the finest girls on the planet," the insider told HollywoodLife.com. "Getting women is a war Drake doesn't want to engage in with Chris. Chris just might swoop in and take Serena from him! Chris does have a tennis court in his backyard, and he's single, too. He'd love to have some one-on-one private sessions with her."

Brown accused Drake of name-dropping by rapping about Tran to promote his music and is angry that Tran turned her affection toward Brown, rather than him.

"Dudes are so jealous of Chris and for the first time in his life, he knows why: Everyone wants to have what he had," a source told HollywoodLife.com in another article. "Key word is had! Chris already had Karrueche -- all of Karrueche! And now Drake and The Game both want her. Pathetic. Can't these dudes be original like they claim to be in their music and get their own girl. Chris thinks they're just second hand dudes who have no game or mouthpiece to pull chicks. If it weren't for the fact that Drake and Game are both famous rappers, they wouldn't have women. Period. But Chris gets it: he gets the finest girl on the planet and all the dudes envy him for that."

Drake and Brown already have tangled over Rihanna, the website added.

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