It’s customary in combat sports that when a long-standing champion loses, they are granted an immediate rematch. A lot of times, it’s written into the fight contract. When Chris Weidman ended Anderson Silva ’s seven-year reign as middleweight champion, Silva was granted an immediate rematch. BJ Penn was given an immediate rematch after Frankie Edgar defeated him at UFC 112 for the lightweight title. Former heavyweight champion Cain Velasquez was defeated by Fabricio Werdum at UFC 188 and a rematch is lined up for UFC 196 in February. The list goes on and on
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If Ronda Rousey Gets an Immediate Rematch, Shouldn’t Jose Aldo? – MMA Weekly