Yahoo!, 13 team, standard 5x5, roto

C Álex Ávila(Det - C)
1B Prince Fielder(Det - 1B)
2B Danny Espinosa(Was - 2B,SS)
3B Ryan Zimmerman(Was - 3B)
SS Erick Aybar(LAA - SS)
OF Justin Upton(Atl - OF)
OF Matt Holliday(StL - OF)
OF Desmond Jennings(TB - OF)
Util Nelson Cruz(Tex - OF)
Util Todd Frazier(Cin - 1B,3B,OF)
P Max Scherzer(Det - P)
P Mat Latos(Cin - P)
P Joe Nathan(Tex - P)
P Huston Street(SD - P)
P Jason Grilli(Pit - P)
P Grant Balfour(Oak - P)
P David Robertson(NYY - P)
P Ryan Cook(Oak - P)
P Sean Marshall(Cin - P)
BN Jake Peavy(CWS - P)
BN Jonathon Niese(NYM - P)
BN Marco Estrada(Mil - P)
BN Tommy Milone(Oak - P)
BN Mike Fiers(Mil - P)

Team looks solid enough. You have a ton of relievers though. Generally don't see that many on a 5x5 team.