SLUGFEST: Jose Canseco accuses A-Rod of cheating on J-Lo

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Jose Canseco threw former Yankee great Alex Rodriguez a curve ball when he accused the slugger of cheating on new fiancee Jennifer Lopez.

The former Toronto Blue Jays and Oakland Athletics star claimed on Twitter that A-Rod was hooking up with Canseco’s ex-wife Jessica.

He tweeted: “Watching World of Dance watching J.Lo text Alex Rodriguez little does she know that he is cheating on her with my ex-wife Jessica poor girl she has no idea who he really is.”

“I was there a few months back with her when he called her on her phone.”

Canseco — a confirmed former steroid user — concluded with a warning.

“Alex Rodriguez stop being a piece of s*** stop cheating on Jennifer Lopez,” he tweeted, adding, “Alex Rodriguez I challenge you to a boxing match or an MMA match anytime you want.”

The two former stars have bitterly feuded for years and Canseco even claimed in his 2008 tome Vindicated that it was him who introduced the younger star to steroids.

The book also revealed that Canseco believed A-Rod had designs on his ex-wife even in the late 1990s.

One year later, in 2003, Rodriguez tested positive for banned substances.

The Yankee slugger was suspended for the entire 2014 season after he was again busted for steroid use.

Meanwhile, the hot-headed Canseco’s marriage to Jessica was hardly one of wine and roses.

He was arrested and charged with battering his wife in Miami in 1997, eventually pleading no contest.

“It turned violent … Mr. Canseco grabbed Mrs. Canseco by the hair, then hit her a few times,″ Miami Police Lieut. Bill Schwartz said at the time.

His ex-wife wrote her own tell-all, Juicy: Confessions of a Former Baseball Wife, claiming the baseball star abused her and frequently cheated with other women.

She noted: “The guy is an a**hole, but the perks are good.”

SLUGFEST: Jose Canseco accuses A-Rod of cheating on J-Lo