 Complete the following phrase:  Also in 201314, Atlético finished top of their Champions League group and qualified for the quarter-finals with a 51 aggregate win over Milan in the round of 16. This was the first time they had reached the Champions League quarter-finals since 199697, when Simeone played for the team. In the quarter-finals, Atlético defeated Barcelona 21 on aggregate from Simeones tactic of cutting the swift-passing midfield of Barcelona in two, thus denying them space and isolating Xavi and Andrés Iniesta from forwards Lionel Messi and Neymar. In the semi-finals, Atlético defeated José Mourinhos Chelsea 31 at Stamford Bridge following a goalless draw at home to reach the 