As far as best record in the American League goes, that's easy. The 75-48 Kansas City Royals are a near-lock to win their division and enter the playoffs with home field advantage throughout.
As far as most in-season drama goes, that's easy too. The Boston Red Sox have not only been one of the biggest disappointments in all of baseball, they've also gone through more changes than a teenager going through a growth spurt.
Larry Lucchino is out, Dave Dombrowski is in. Ben Cherington is out, and a general manager to be named later will eventually be in.