Choose a venue to play on. If you choose Australian Open, you will play with Djokovic, who's top serve speed is about 129.3 mph. If you choose French Open, you will play with Nadal, who's top serve speed is about 127.2 mph.. If you choose Wimbledon, you will play with Federer, who's top serve speed is about 138 mph.If you choose U.S. Open, you will play with Murray, who's top serve speed is about 142.4 mph. Press space until the grey circle is as big as you think it can get. Then let go, and see your speed in mph.
Credit to Djokovic, Nadal, Federer, Murray. And to all the Grand Slams
