Here are a few of Roger Gracie's matches from the most recent World Championships. Not sure how long they'll be live on YouTube, but you'll notice that Roger Gracie is a machine. He won all of his matches (I believe there were nine total matches between his weight category and the open-class) with chokes from the mount.
There are some nice takedowns, sweeps and transitions in all three matches that I've linked together below. The next video will automatically play after the previous one ends. Again, I'm not sure how long these will be "live" so catch them while you can.
Train hard while I'm in Colorado -- see you all on the mat when I return!