advance on away goals. In the 2010 semi-finals of the Champions League, José Mourinho's Internazionale players denied Barça space as they double-marked Messi and prevented Xavi from achieving a successful passing rhythm. Inter won the first leg 3–1, and then lost 0–1 to advance on aggregate 3–2. Mourinho would become manager of Real Madrid the next season and employ similar tactics, resulting in a bitter domestic rivalry with Guardiola over the following two years. 2011–2012 season Chelsea manager Roberto Di Matteo succeeded in countering tiki-taka when his team met Barça in the semi-finals of the 2011–12 UEFA Champions League. According to Chelsea's Fernando Torres, concentrating on space rather than trying to steal the ball was part of his squad's strategy to counter Barça. Winning battles on the wings, such as Ramires against Dani Alves, would force Barça to funnel their attacks toward the centre of the field. Former Chelsea winger Pat Nevin noted that stationing three disciplined midfielders in front of the back four defenders denied Barça space, forcing Lionel Messi to withdraw deeper and narrower to get to the ball (as Messi was high on the pitch, he was stripped of the ball by Chelsea's Frank Lampard, which led to a goal for Chelsea in the first leg). During the second leg, Di Matteo deployed a 4–5–1 formation with a very compact midfield structure. While Barça enjoyed 73% of ball possession over the two legs and 46 shots to Chelsea's 12 (11 of these shots on target versus Chelsea's four). By contrast, Chelsea's Frank Lampard completed two telling passes in the two legs; both of them leading to goals. It has been suggested that Barça's weakness offensively is winning balls in the air, especially against a team like Chelsea that has the size and strength to control balls in the box. Chelsea achieved a 1–0 victory in the first leg and a 2–2 tie in the second to overcome Barça. 2012–2013 season The next season, Barcelona faced Massimiliano Allegri's A.C. Milan in the Champions League round of 16. In the first leg at the San Siro, Milan employed a very narrow 4–4–2 formation, with Stephan El Shaarawy acting both as a second striker and a fifth midfielder, ready to break in behind Dani Alves, and Sulley Muntari closely man-marking Xavi in the center. Thus, Barcelona had only one chance on goal and ended up losing 2–0. In the second