Rays
A baseball team that started in 1998.  They were in last place every year from 1998 to 2007.  Then, in 2008 they changed their name from the "Devil" Rays to just the Rays.  This "new team" is completely transformed and became the first team in MLB history to be the best team in the MLB after a year in which they were the worst team.
Did you hear about the Rays?  They are in first place ahead of the Red Sox and Yankees.