Sad day for wrestling fans!!!

Macho Man Randy Savage -- one of the greatest wrestlers of all-time -- died today in a car accident in Tampa, Florida ... TMZ has learned. TMZ spoke with Randy's brother, Lanny Poffo, who tells us the wrestling legend suffered a heart attack while he was behind the wheel around 9:25 AM ... and lost control of his vehicle.

Earlier this month, Savage celebrated his 1-year anniversary with his new wife Lynn.

Savage was 58.

Macho Man began wrestling in the WWF in 1985 and became a superstar with his trademark catchphrase "Ooooooh Yeaahhhhh." Savage was so popular, he became the spokesperson for Slim Jim in the mid '90s ... and became virtually synonymous with the brand.