By Grey Whitebloom Barcelona travel into enemy territory to face Real Madrid in La Liga on Sunday afternoon. The Catalans will be led by a veteran of the fixture during his playing days. Xavi Hernandez played in a staggering 42 clasicos, scoring five times and teeing up another ten. However, the Barcelona-born midfielder lost to Real Madrid (13) more often than any other club in his career. Here’s the XI the former Blaugrana skipper may deploy to avoid another defeat on the grand stage. 1. Barcelona XI (4-3-3)GK: Marc-Andre ter Stegen – Despite conceding seven goals in four European games, Ter…