Another vote for Mythos here. Also, check out NBA City, which is at CityWalk but is literally right next to the entrance of IOA. We are not big basketball fans but it was a fun place and the food is SURPRISINGLY good. We ate there twice during our stay.
Actually, the food at every CityWalk restaurant was much better than I had expected. We ate at Emeril's (no surprise there--the food is fantastic with service to match), Pastamore, Motown Cafe,
and NBA City and were happy with each of them.
If you are not familiar with the Universal Orlando layout, CityWalk sits just on the other side of a bridge between IOA and US. It is
easy to leave the park for a nice leisurely lunch (or dinner, of course) and then return to one or both of the parks for more fun!
Enjoy.