We collected a handful of Grade A gifs to honor them. Happy 4th of July. Our editor, having some issues Jump fail Right in the ear The most incredible ball boy catch ever Bounce fail Wimbledon ...

As the toss goes up, players press their feet against the court, using ground reaction forces to build up elastic potential energy--rotations ... service court. A tennis ball's spin barely ...

who has used high-speed cameras to study tennis ball rotation for years. "From .85 to 1.2 seconds. In that time, the ball turns over 50 or 60 times." That is from 3,000 to 3,600 revolutions per ...