Watching high level fighters spar is a lot of fun to watch. The video showing Anderson Silva spar against Machida and Noguiera taught us a lot.
This video shows two of the top mixed martial artists sparring (Shogun vs Junior dos Santos) with a good old kickboxing match from back in 2008 at Team Noguiera in Rio.
Pay attention to the combinations used in this sparring match. If you want to learn how to spar well, watch how these guys create and take advantage of openings.