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Sammy Sosa My Son Rolando ... MLB's Next Big Thing!!!

Move over Vladimir Guerrero ... Sammy Sosa says it's HIS son who will be the MLB's next big thing -- telling TMZ Sports his 5-year-old boy is legit!!!

We got Sosa out at LAX this past week when he revealed his son, Rolando Sosa, has a sweet swing ... and he's projecting BIG things for him in about a decade.

"He's going to be good," Sosa says ... "He's got a good swing."

Sammy scoffed at the idea of his boy being a pitcher when he grows up .