So how did this happen?
"A couple weeks ago, I was on deck and this guy started talking to me and he said, 'Mook, if you hit a home run, I'll name my daughter - her middle name - Mookie,'" recalled Betts.
He really didn't believe Giuseppe Mancuso at first but that changed pretty quickly.
"Your wife wouldn't like that, don't do that bro," Betts recalled telling Mancuso. "I think he may have been on the phone with her."
Minutes later, it happened.
Betts hit a home run, circled the bases and gave Mancuso a fist bump. Then came the cherry on top.
"A couple of weeks later, I see on Twitter the birth certificate - Francesca Mookie Mancuso."
The dad's a man of his a word and proved it on Twitter, sharing baby Francesca's birth certificate (he really did it!) and precious photos.