Tucker by knockout. Tucker was way over the hill when he fought Lewis, but even that version knocks Takam out. Takam has no power, poor stamina, and has failed to be competitive against any top fighter he has faced. Tucker would hurt Takam worse than Povetkin did.
This. Exactly why Povetkin was able to floor Takam and keep him there even though Joshua is the bigger and stronger fighter. Joshua had the power to end Takam at anytime, but wasn't used to dealing with all the head and upper body movement from Takam.