ATP Experiments With Shot Clocks, Towel Racks, Other Rule ChangesRule changes -- such as towel racks, shorter sets, reduced warm-ups and a 25-second shot clock -- will be further trialed in tennis, and could be introduced on the men's tour as early as 2019.
Djokovic Tops Federer In ATP FinalsReigning two-time year-end No. 1 Novak Djokovic defeated six-time event champion Roger Federer in Monday's marquee finale at the season-ending ATP World Tour Finals.