What the heck is going on with Rafael Nadal? More mailbag

4. Stanislas Wawrinka is a real wild card here. • Jason of Austin thinks he can top that with long-lost sisters: actress Jenna Fischer and Mirka Federer.

Jon Wertheim | Apr 30, 2014

What the heck is going on with Rafael Nadal? More mailbag /

Rafael Nadal lost in the quarterfinals in Monte Carlo and Barcelona -- events he's previously dominated. — Rafael Nadal lost in the quarterfinals in Monte Carlo and Barcelona -- events he's previously dominated / Getty Images

4. Stanislas Wawrinka is a real wild card here.

Kei Nishikori breezed through to win the Barcelona Open following Rafael Nadal's loss in the quarterfinals. — Kei Nishikori breezed through to win the Barcelona Open following Rafael Nadal's loss in the quarterfinals / Getty Images

• Jason of Austin thinks he can top that with long-lost sisters: actress Jenna Fischer and Mirka Federer.

Published Apr 30, 2014

JON WERTHEIM

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 with his wife, who is a divorce mediator and adjunct law professor. They have two children.