#3 Fight like the smaller man: The Mike Tyson and Evander Holyfield playbook
Boxing legends Mike Tyson and Evander Holyfield weren't particularly big for the Heavyweight division during their respective primes. While Holyfield did stand at 6'1", Tyson is said to be barely 5'9" or 5'10" at the most.
In comparison to the aforementioned legends, Alexander Povetkin stands at 6'2", whereas Anthony Joshua is a towering 6'6". Now, Tyson and Cruiserweight-turned-Heavyweight Holyfield, almost always gave up size to their foes in the division of giants...Regardless, both Tyson and Holyfield added excellent in-fighting techniques to their combat arsenal, so as to enable them to beat their larger and longer opponents up on the inside.
Povetkin is a good fighter at close range, however, what truly shocked fans of the Russian phenom is that he showed absolutely no signs of his famed close-range boxing skills. And this isn't merely down to Joshua being a strong unit and preventing his foe from doing so, but rather on Povetkin's strange tactic of jumping into close range, only for him to spam the left hook time and again rather than clinching up, dirty-boxing, and then separating from the bigger guy...