Prospects Vladimir Guerrero Jr., Peter Alonso knocking on door to major leagues

SURPRISE, Ariz. — One of the biggest questions as we look toward the 2019 MLB season is how big a role will the game's top prospects play on their parent clubs. 

Judging from their performances in the Arizona Fall League — and in the league's annual Fall Stars Game — third baseman Vladimir Guerrero Jr. of the Toronto Blue Jays and first baseman Peter Alonso of the New York Mets should open the season on a major-league roster. 

Both young players did some amazing things Saturday night at the annual showcase event, which was won by the West All-Stars 7-6 on a walk-off single by Kansas City Royals catcher Meibrys Viloria.

Guerrero, 19, flashed some of the skills that made him the unquestioned No. 1 prospect in the minors. In the fifth inning, he hit a double off the left field wall that had an exit velocity of 117 mph. 

To put it in perspective, a total of 11 hitters in the majors last season hit a ball with an exit velocity of 117 mph or higher. That's 11 players … ALL SEASON.

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