Detroit's middle infield problem

US PRESSWIRE, Getty Images

It's often said that the best way for baseball teams to build a championship squad is up the middle, with middle generally referring to catcher, second base, shortstop and center field. In Austin Jackson and Alex Avila, the Detroit Tigers -- a team with World Series aspirations -- have half of that equation solved, but second base and shortstop could once again grow to be the team's Achilles' heel.