Barcelona's Lionel Messi reacts during his Champions League semi-final first leg soccer match against Bayern Munich at Arena stadium in Munich, April 23, 2013. Clinical Bayern Munich inflicted Barcelona the highest loss in 16 years as the Bavarians swept the Catalans 4-0 thanks to the brace by Thomas Mueller at the first leg of Champions League semifinals on Tuesday. (Xinhua/AFP Photo)
Bayern Munich's Arjen Robben celebrates for the ball over Barcelona's Jordi Alba during their Champions League semi-final first leg soccer match at Arena stadium in Munich, April 23, 2013. Clinical Bayern Munich inflicted Barcelona the highest loss in 16 years as the Bavarians swept the Catalans 4-0 thanks to the brace by Thomas Mueller at the first leg of Champions League semifinals on Tuesday. (Xinhua/AFP Photo)
Barcelona forward Lionel Messi (L), of Argentina, controls the ball next to Bayern's Franck Ribery of France during their Champions League semi-final first leg soccer match at Arena stadium in Munich, April 23, 2013. Clinical Bayern Munich inflicted Barcelona the highest loss in 16 years as the Bavarians swept the Catalans 4-0 thanks to the brace by Thomas Mueller at the first leg of Champions League semifinals on Tuesday. (Xinhua/AFP Photo)
Bayern Munich's players celebrates with team mates Franck Ribery (2nd L), Mario Gomez (L) and Javi Martinez after scoring against Barcelona during their Champions League semi-final first leg soccer match at Arena stadium in Munich, April 23, 2013. (Xinhua/AFP Photo)
Barcelona's goalkeeper Victor Valdes reacts during his Champions League semi-final first leg soccer match against Bayern Munich at Arena stadium in Munich, April 23, 2013. Clinical Bayern Munich inflicted Barcelona the highest loss in 16 years as the Bavarians swept the Catalans 4-0 thanks to the brace by Thomas Mueller at the first leg of Champions League semifinals on Tuesday. (Xinhua/AFP Photo)