Mavs 108, Rockets 133

[omahen]

I actually think Luka's defense has not been improved this year other than those couple games where he really put in the effort

I think it is very simple. Luka can play defense but he can't play it, because he is too tired of doing too much on the offensive end. When Mavs bring in another guy able to take part of the offensive load, Luka will have more energy to play defense. But with this tempo of games and the amount of stuff he is asked to do, don't expect him to be able to play it.