Every time top Chicago Cubs prospect Kris Bryant hits a home run, proud papa Mike Bryant beams back home in Las Vegas.

When Texas Rangers top prospect Joey Gallo goes yard with his powerful swing, Bryant gets a charge out of that, too.

Bryant doubled down, all right. He taught his son and Gallo how to hit when they were kids, passing along the lessons he learned from Ted Williams during the two spring trainings he was a Boston Red Sox farmhand in the early 1980s.

Now Bryant and Gallo are staging a home run derby as they make the climb to the major leagues.

Bryant hit his 39th homer Tuesday night, tops in the minors. It was the 17th with Triple-A Iowa.

Gallo (below) has hit 38, inlcuding 17 with Double-A Frisco.