Coverage for the ABN AMRO World Tennis Tournament begins Monday on Tennis Channel & Tennis Channel Plus.
Roger Federer's wild card entry into Rotterdam next week will give him a shot at the No. 1 ranking currently held by Rafael Nadal.
Along with potentially extending Federer's record 302 weeks in the top spot, it also brings into play 33-year-old Andre Agassi's record as the oldest player to hold the men's No. 1 ranking.
Federer had not been scheduled to play the indoor ATP 500 event, but organizers announced his participation just days before play begins. He has not played the tournament since 2012, but his relatively undemanding journey to the Australian Open title, along with the opening for No. 1, might have helped prompt him to join the field.
Federer would reach No. 1 if he can get to the semifinals or further in Rotterdam, the ATP has confirmed, while Nadal is not scheduled to return to play until Acapulco in three weeks.