Live hand: Bottom pair, ugly river

[mmcd]

5 handed 75/150.

UTG who is a so-so player but always thinks I'm making moves on him opens. I've been beating him up pretty good FWIW. I call in the bb with A5o.

Flop:

9 7 5 r.

I check, he bets, I call.

Turn:

9 7 5 T

I check, he bets, I raise, he quickly (and somewhat defiantly) calls.

River:

9 7 5 T J

I check, he bets very quickly, I beat him in the pot.