Most Dramatic Turnaround For Athlete Reputations

Over the course of the last fourteen months, we have seen the reputation of LeBron James go from "the out-house" with losing the 2011 NBA Finals to the Dallas Mavericks, to the "penthouse" by winning the 2012 NBA Finals over the Oklahoma City Thunder and bringing home an Olympic gold medal with Team USA. What other athletes have had dramatic turnarounds in their careers from bad to good?