[citation needed] Alston was drafted in the first round (10th overall) of the 2009 MLS SuperDraft by New England Revolution after signing a Generation Adidas contract with Major League Soccer.

He made his professional debut on March 21, 2009, in New England's first game of the 2009 MLS season against the San Jose Earthquakes.

[1] Alston was selected to his first Major League Soccer All-Star Game during the 2010 season and was in the starting lineup for the match in Houston against Manchester United.

[2] Alston scored his first professional goal in the final of SuperLiga 2010, but the Revolution lost 2–1 to Monarcas Morelia of Mexico.

[5] Alston was a member of U.S. Soccer's Residency Program and the Under-17 National Team from September 2003 through his enrollment at Indiana in January 2006.