If you spent any amount of time on Twitter yesterday, you probably noticed that Angels wunderkind Mike Trout celebrated his 21st birthday on Tuesday. Now that Trout is of legal drinking age, who assumes the title of Baseball's Best 20-Year Old?

Nine Contenders
Tyler Austin, Yankees
Kaleb Cowart, Angels
Manny Machado, Orioles
Aaron Sanchez, Blue Jays
Jonathan Singleton, Astros
Jameson Taillon, Pirates
Oscar Taveras, Cardinals
Mason Williams, Yankees
Christian Yelich, Marlins

BP's in-house prospect guru Kevin Goldstein shared his opinion with me via Gchat this evening: