No problem! I love my YA fiction and have read most of the big names in the genre. If he's read The Hunger Games, he'll love Gregor the Overlander. As a plus, the ending is slightly happier (if not 'happy' by most people's standards).
There aren't that many YA books aimed at boys. I think he might like Percy Jackson and the Lightning Thief by Rick Riordan. I've read it (but not reviewed it) and it's actually a pretty good book that the movie doesn't do justice to. Of course there's also the classic Harry Potter series, but he's probably already read that!
Many YA books are aimed at girls, but then again, I'm pretty biased as that's all I read for a while. I'll try and see if I can put up more reviews of books boys would enjoy as well.