You tried going to http://www.changeovertennis.com/things-we-learned-on-day-1-of-the-2015-us-open/capture-2/BackSwings, and it doesn't exist. All is not lost! You can search for what you're looking for.
http://www.changeovertennis.com/things-we-learned-on-day-1-of-the-2015-us-open/capture-2/BackSwings