Sam Adekugbe, Defender (Vancouver Whitecaps)
Adekugbe is just 18 years old, but the fullback has been steadily maturing since signing a professional contract after two years in the Whitecaps Residency program.
He's started just two games, one apiece in 2013 and 2014, but has been a force in each match on the left flank.
In Adekugbe's only start in 2014 thus far against Toronto FC, the young Canadian had to fill in for the suspended Jordan Harvey. The 18-year-old looked composed, positioned himself well and was able to prevent Jonathan Osorio and Mark Bloom from making any dangerous runs from the left.
Adekugbe misses out on the list due to his inexperience, but his two performances have given Whitecaps fans a glimpse of his potential. He could become a stalwart at left back for both club and country very soon.
Matt Miazga, Defender (New York Red Bulls)
Miazga is another homegrown talent who has taken part in matches with the senior squad. The 19-year-old has made seven appearances with the Red Bulls this season—six of them starts.
The center back looked particularly strong against the New England Revolution this past June. It was Miazga's second start and just his third professional game.
Miazga is slowly starting to come into his own. With a few more games at this rate, he'll be in the top five.