FIFA.com sets the scene for the first-leg matches in the 2011 Copa Libertadores quarter-finals which take place on Wednesday and Thursday, with Once Caldas and Santos staging the only tie between former champions.
Source: Survivors set for last-eight challenges (http://www.fifa.com/worldfootball/clubfootball/news/newsid=1432355.html?cid=rssfeed&att=)