Joshua vs Pulev
Joshua should use the early rounds to exploit Pulev's age, the jab will keep Pulev occupied, keep his head moving, and it will take more out of Pulev to take jabs and even to bend the knees and slip, than it will take out of Joshua to throw a fast jab without much power behind it. The jab scores points, but a fast double jab will make it harder for Pulev to land his counter jab, and if Joshua can out jab Pulev, I think he wins the rounds, with Pulev's lack of variety. Pulev will clinch, will probably use jab and grab tactics, but Joshua shouldn't wait for the referee to call a break, he should use his height and strength, push Pulev back, lean on him, and also try to work in the clinches, even if he can't generate much power, land punches if he can, go to the body, it will be hard to land body shots at long range, but even body shots without a lot of power could pay dividends later in the fight.
Pulev shouldn't try to match Joshua for output, he should land the counter jab when the opening is there, feint with the jab, don't let him get into a rhythm of landing the double jab, also feint with the right hand, be wary of the counter left hook, discourage Joshua from throwing that shot, take Joshua's mind away from the right hand with a throw away jab before throwing it. I think Pulev should throw the short right hook to the side of the head in close, and rough Joshua up.