Martinez-Pavlik i think Martinez-William I is a good example as well, even though he didn't win (although he should have)
Good call he changed from working behind the jab to a more defensive style of avoiding shots and covering up letting Clubber tire himself out.
(From another post) In the Katsidis fight, Marquez was using a lot of lateral movement and sticking the jab (not always his favorite weapon) straight through Katsidis' guard, before walking him into body punches. I think he realized it was going to be a tiring night if he kept at it, so he started countering against the ropes with a very squared head-movement oriented defense (something we hadn't seen as much of previously.) To nullify the left hook, he started weaving under and countering, but also recounted that he would catch the left hook with his right glove by his cheek, and fire the right immediately after inside his guard off of the parry, in order to discourage him from throwing it in the first place. Ray Leonard was being stalked by Hearns in their first fight, scurrying around the outskirts of the ring defensively and trying to get some offense going while under fire from the heavy-handed lankiness of Hearns. Once he abandoned all caution and was able to hurt him, he visibly became the aggressor, controlling the center of the ring while Hearns became the boxer trying to survive further assaults and protecting an early lead. Cotto and Mosley switched roles similarly in their fight, with Cotto fighting defensively towards the end to snatch a points win. Pacquiao sometimes switches from being an aggressor to walking fighters into punches, and it surprises his opponents (Cotto, Margarito). De La Hoya tried similar things throughout his run with Mayweather Sr. Hopkins will regularly pick his angles based on the first few rounds of a fight, and utterly confuse his opponent by constantly switching between an outside boxer and a rushing, punishing inside fighter.
