Arsenal secured a commanding 3-0 victory over Real Madrid in the first leg of the Champions League quarter-finals. It is often said that being the underdog can be an advantage, and Arsenal appeared determined to prove that point as they faced the most successful club in Champions League history. The Gunners may have benefited from a favourable draw in the round of 16, but they also showed real intent and sharpness from the outset. They dictated the tempo early on, pushing Madrid into a high-paced attacking battle and threatening the…