KANSAS CITY, Missouri, July 10 : Switzerland players have heaped praise on Lionel Messi ahead of Saturday's World Cup quarter-final against Argentina, but said they have identified weaknesses in the defending champions and believe they can cause an upset.Midfielder Denis Zakaria described Argentina as the best team in the world and Messi as the game's outstanding player, but insisted his side had the quality to contain the eight-times Ballon d'Or winner and derail the South Americans' title bid."It will be up to us to produce a very big performance if we want to beat them," Zakaria told reporters. "Obviously, it's always difficult to stop a player like that, but I think we have the quality and we have the players to do it."Switzerland, who eliminated Algeria and Colombia in the knockout ro