I'm also surprised Martin went long enough. And the fight was actually close. All judges had it 3-4 after round 7 where Tank only has 1 round advantage. It could be true that Martin sparred a bigger puncher than Tank which is why he survived that long. Martin probably felt those punches even if there were head gears during sparring sessions.
He was really doing good and was able to stay away from Tank Davis power. And he did played it tactically as what his promoter/manager Errol Spence said pre fight. But you can only last that long, unless you really have unlimited gas tank. So by the middle of the rounds, we can see that Martin is slowing down a bit and then being caught slowly by Tank in the body.
Anyways, as expected, it's another KO win by Tank. My question remains the same over the years. When's the time he stops being a coward and fight the other champions? He may avoid WBC champ Shakur but IBF king Loma is already old and is no longer the same during his prime years. WBO holder Berinchyk is not popular and should be very easy to negotiate if Tank wants to unify.
Tank says that he is willing to fight Loma next. But it seems that also waited for so long until Loma is 36 years old. So that's what most critics are throwing on Tank right now. I don't think that he is willing to fight Shakur, but Shakur seems to be calling out Tank after his win, so let's see.