World number one Rafael Nadal will play in the Buenos Aires ATP tournament in February for the first time since 2005.
Roger Federer should play until he is 60 if he wants to, according to Romanian former world number one Ilie Nastase.
Boca Juniors all but blew their chances of winning Argentina's league championship on Sunday when they were upset 2-0 by troubled All Boys at La Bombonera.
Novak Djokovic has beaten Rafael Nadal again, less than two weeks after his triumph at the ATP Tour Finals in London.
Serbia's decision to omit Novak Djokovic from the doubles was "like leaving a Ferrari in the garage", said Radek Stepanek.
The Czech Republic won their second successive Davis Cup title after Radek Stepanek beat Dusan Lajovic 6-3 6-1 6-1.
Novak Djokovic powered past Tomas Berdych 6-3 7-6 6-2 to draw Serbia level with Czech Republic in the Davis Cup final.
Serbia's Novak Djokovic has been left out of Saturday's doubles in the Davis Cup final against holders Czech Republic.
Tomas Berdych and Radek Stepanek beat Ilija Bozoljac and Nenad Zimonjic to give Czech Republic a 2-1 lead in the Davis Cup.
Novak Djokovic won the opening match of the Davis Cup for Serbia before Tomas Berdych restored parity for the Czech Republic.
The International Tennis Federation (ITF) is confident its anti-doping programmes are working effectively.
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