The Tennis Game-Changer

Ashley Fetters investigates the sport's use of instant review technology, which allows players to challenge line calls by the chair umpires. The influence has not been entirely positive:

Roger Federer's chief complaint was that challenges actually put undue pressure on the players to know whether balls were inside or outside the line. "We would like to be able to rely a little bit on umpires," Federer said. "They tend to now just let us do the work, the tough stuff. They let us get embarrassed, basically." And that's true: The humiliation factor works on players, too. Being wrong in public is hard for everybody, and it's a bummer to have wasted a challenge when only a meager three are allotted. Plus, stadiums full of fans have been known to snicker at players who make challenges on obviously valid calls.