I'm not sure about Ginobili's exact weight, but if he can bulk up a bit more, he could be a solid defender. Coach Pop is a defensive minded coach, so he'll obviously help Ginobili a lot. Bruce Bowen is a defensive specialist, so having Bowen on the team will also help Ginobili adjust to the defensive aspect of the NBA. Ginobili's defense should get better with time. How he holds up in an 82 game regular season, only time will tell. As long as he puts on some more muscle, I think that should help his offensive game and defensively he won't get abused by other guards too much.