Tennis: Rafael Nadal's injury and Federer's return to the courts | Video | CNN

Less than a week before the start of the Australian Open, Rafa Nadal alarmed tennis lovers after withdrawing, due to physical discomfort, from a game in the ATP Cup, a tournament that precedes the first Grand Slam of the year.

Elizabeth Pérez tells us in what state the Spanish is and talks about the expected return of Roger Federer to the courts, after his double knee operation.