6 years agoToronto Blue Jays third base prospect Vladimir Guerrero Jr. is the most exciting young player yet to make his big-league debut. He's ranked number one overall on MLB.com's prospect list heading into the 2019 season for a reason. Still only 19, Vlad has the raw power to make an immediate impact for Toronto whenever he's called up, which is likely to be early next season. He quickly proved that minor league pitching was no match for him in four levels on the farm last season, hitting a combined .381/.437/.636 (1.073 OPS) with 20 home runs, 78 RBI and 67 runs in 95 games. A strained patellar tendon in his left knee last summer might've cost him a September call-up, but he's obviously not far off in 2019. Guerrero has effortless raw power to all fields and consistently makes loud and hard contact as he barrels baseballs up. Unlike his free-swinging father, Vlad Jr. has much better plate discipline at a young age, which bodes well for his future. He walked 11.7 percent of the time at Triple-A and struck out just 7.8 percent of the time. Guerrero easily has 30-homer power at the next level and could become a perennial All-Star in one of the best hitting environments in baseball. If he's not already owned in keeper/dynasty formats, he'll be a surefire first-round pick in those leagues. Even without taking a single MLB at-bat, he's considered a top-15 fantasy third baseman by RotoBaller.--Keith Hernandez - RotoBaller