The last-four line-up is a surprising one, but which teams can take an edge into next week's second legs? FIFA.com previews the upcoming Santos-Cerro Porteno and Penarol-Velez Sarsfield matches.
Source: Semi-finalists out to seize advantage (http://www.fifa.com/worldfootball/clubfootball/news/newsid=1440585.html?cid=rssfeed&att=)