Kelly Hirano, vice president of engineering, demonstrates the Yahoo Sports Daily Fantasy contest during a product launch in July in San Francisco. Yahoo has designed this experience for the mobile fantasy player and offers Daily Fantasy, Full Season Fantasy, and real-time sports news and scores as an all-in-one experience. Eric Risberg/AP hide caption

itoggle caption Eric Risberg/AP

Head coach Jill Ellis of the United States celebrates with fans after the USA's 5-2 victory against Japan in the FIFA Women's World Cup Canada 2015 Final in July. Kevin C. Cox/Getty Images hide caption

itoggle caption Kevin C. Cox/Getty Images

Reporters and Major League Baseball employees watch a demonstration of new statistics made possible by technology upgrades at baseball stadiums during an April 20 news conference in New York. Seth Wenig/AP hide caption

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A giant All-Star Game sign at Great American Ballpark during a baseball game between the Cincinnati Reds and Washington Nationals, on May 30 in Cincinnati. John Minchillo/AP hide caption

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Marcel Granollers (left) and Roger Federer leave the court at the U.S. Open in Flushing, N.Y., last August. Commentator Frank Deford says with all that baggage, tennis needs caddies. Leslie Billman/Ai Wire/Landov hide caption

itoggle caption Leslie Billman/Ai Wire/Landov

Serena Williams serves the ball to Andrea Hlavackova during the first round of the French Open in Paris. Christophe Ena/AP hide caption

itoggle caption Christophe Ena/AP

Charles Ornstein with his parents at his Bar Mitzvah. Through their voice messages, saved on his phone, Ornstein has a trove of verbal memories. Courtesy of Charles Ornstein hide caption

itoggle caption Courtesy of Charles Ornstein