Boston Red Sox top prospect Marcelo Mayer seems to be getting close to making his Major League debut. Mayer's well-rounded game has helped him to rise quickly through the minors and kept him near the top of the top prospects list throughout the last few seasons. He's almost ready to make an impact in the majors after a strong showing in Triple-A this season.As a result, Mayer is definitely someone fantasy managers should have on their radar at this point in the season, especially if you're in ...