Contemplating a Murray-McEnroe coaching partnership; more mailbag

My attitude: If you have the capacity for accuracy, why not maximize it? Let the players issue as many challenges as they fit. Those abusing the system or challenging excessively will be exposed and deterred by the court of public opinion. And, as Fred notes, there is an irony that on clay, which doesn't use Hawk-Eye, appeals are limitless.
• You will have a hard time topping this for long-lost siblings.

Jon Wertheim is a senior writer for Sports Illustrated and has been part of the full-time SI writing staff since 1997, largely focusing on the tennis beat, sports business and social issues, and enterprise journalism. In addition to his work at SI, he is a correspondent for “60 Minutes” and a commentator for The Tennis Channel. He has authored 11 books and has been honored with two Emmys, numerous writing and investigative journalism awards, and the Eugene Scott Award from the International Tennis Hall of Fame. Wertheim is a longtime member of the New York Bar Association (retired), the International Tennis Writers Association and the Writers Guild of America. He has a bachelor’s in history from Yale University and received a law degree from the University of Pennsylvania. He resides in New York City and Paris with his wife, who is a divorce mediator and adjunct law professor. They have two children.