Prior to one of the biggest fights of his career, Mosley began training with Naazim Richardson. Mosley regained the WBA (Super) welterweight title from Antonio Margarito on January 24, 2009 at the Staples Center in Los Angeles. Mosley, now 37 years old, came into the fight as a 4–1 underdog with the bookies after Margarito had spectacularly stopped Cotto 6 months earlier. Prior to the bout, very few gave Mosley a chance of prevailing, with the prevailing view that Margarito was too strong and young for Mosley. The conventional wisdom was that this was a mismatch, which would end in a brutal retirement-forcing stoppage for "Sugar" Shane. A comparison of their last fights; the aforementioned destruction of Cotto by Margarito and a last-gasp knockout by Mosley in a hard twelve round struggle against Mayorga did not bode well for Mosley. Some predicted a massacre. And it was – only it was Margarito that was ruthlessly clubbed about the ring, unable to land any meaningful shots.