SURPRISE, Ariz. - Future Toronto Blue Jays third baseman Vladimir Guerrero Jr. was surely the main headliner at Saturday's Arizona Fall League Fall Stars game in sunny Arizona, but there were plenty of prospects with imminent big league futures that fantasy managers should also be looking out for. Guerrero, who will turn 20 years of age in mid-March, reached base via hit in one of his five plate appearances, but the fifth-inning double he rocketed off Houston Astros right-hander Trent Thornton and the left field wall was one of the hardest-hit I have ever seen in person and wowed the nearly 7,000 fans in attendance.