
Instant replay made its debut at the U.S. Open this week. And it was great. It made tennis matches much more exciting. Now if they would just get rid of lets. The 10 small cameras tracking shots measure marks within three millimeters. Only the Ashe and Armstrong stadiums have the system because it costs $300,000. Players get two challenges per set plus another one for tiebreakers. If the call is reversed, the player keeps the challenge.We believe...