then went to 31–4, avenging his DQ loss to Okami back in 2006. A rematch with Chael Sonnen was to take place on 23 June 2012, at UFC 147, but the bout was moved back to 7 July 2012, at UFC 148, while the expected co-feature of the Brazilian event, a rematch between Vitor Belfort and Wanderlei Silva would headline the event. The change was due to a scheduling conflict with the UN Conference Rio+20, which occurred during the same time frame as UFC 147. At UFC 148, after again being dominated throughout the first round, Silva stopped Sonnen in the second with a TKO. He became the first to stop Stephan Bonnar via strikes in the 1st round of a light heavyweight bout on 13 October 2012, at UFC 153. Title loss and injury Despite having decided to retire after the Bonnar fight, Silva faced Chris Weidman on 6 July 2013, at UFC 162. Although he was the heavy favorite, he lost by KO in the second round after show boating, ending his streak of the longest title reign in UFC history. A rematch was held at UFC 168 on 28 December. Weidman dominated the first round; it was reported that Silva may have also cracked his shin bone against Weidman during the first leg check. In the second round Weidman checked one of Silva's leg kicks again, breaking Silva's left fibula and tibia and ending the fight via TKO. Immediately after the fight, Silva had orthopedic surgery to stabilize his tibia with an intramedullary rod; his fibula was reset and was not expected to require further surgery. A UFC statement called the surgery "successful" and said those with similar injuries generally take three to six months to recover. Post-championship reign Despite calls for Silva to retire from MMA, it was confirmed on 29 July 2014, that Silva would return to the organization. Before UFC 179, Silva and the UFC agreed on a new, 15-fight contract that replaced their previous deal which had eight fights remaining. On 29 October 2014, it was announced that Silva would coach opposite Maurício Rua for The Ultimate Fighter: Brazil 4, which began filming in early 2015. Despite being coaches on the show, the two fighters will not face each other at the end of the season. Silva's continued participation was briefly in doubt during the filming after the announcement of his failed drug