Barcelona produced a football master class in Germany as they beat Bayer Leverkusen 3-1 in the first leg of their quarter-final tie in the Champions League. Alexis Sanchez scored his first Champions League goal, in the 41st minute. Leverkusen came out with a much more positive outlook after the break, leveling through Michal Kadlec. Sanchez made it 2-1 in Barca's favor early in the second half and 2 minutes from the end of regulation time, Lionel Messi struck to hand Barca 3 away goals and victory in the first leg.For more log onto: http://alpha.newsx.com.