According to this article ..

Rafael Nadal will play exhibition match in Colombia

The organization Imlah of Colombia, headed by general manager Manuel Maté, is again surprising the country.

After having organized the exhibition match between Andre Agassi and Pete Sampras, in 2011 Imiah will bring the current best tennis player in the world.

Rafael Nadal will be in Bogota for an exhibition match, although details of that visit will be announced on Thursday at a press conference convened by Imlah.

According to this tweet
Rafael Nadal will play world # 1 in Bogota on Monday 21th March 2011 against a great rival to announce tomorrow at 10:30 a.m.