Images from the Champions League matches played across Europe on Wednesday.
AC Milan's season slumped to a new low on Sunday as they had two players sent off and lost 2-1 at Udinese while the bizarre postponement of the Cagliari-AS Roma match further damaged Serie A's fading credibility.
Inter Milan suffered their first defeat in six games under new coach Leonardo when the Serie A champions deservedly lost 3-1 at in-form Udinese on Sunday.
Colombia scored two first half goals to tame hosts the United States and open the Copa America tournament with a convincing 2-0 victory in front of a big crowd on Friday.
Yet Milan's defensive frailty was punished when Konstantinos Fortounis scored from the penalty spot in the 81st minute to give his side the win that left them second in Group F on 10 points.
Sulley Muntari salvaged a point for AC Milan with a second-half equaliser in a 2-2 draw at the San Siro on Monday that saw visiting AS Roma slip five points behind Serie A leaders Juventus.
Paris St Germain's Zlatan Ibrahimovic scored his first Ligue 1 goal this season before missing a penalty as they beat En Avant Guingamp 3-0 to extend their lead to four points on Tuesday.
Chelsea reached the Champions League knock-out stage on Tuesday despite a 1-0 defeat by Basel in Group E after a late Mohamed Salah goal shocked the 2012 title winners, with Jose Mourinho saying they deserved to lose. Barcelona, without Lionel Messi but already into the last 16, went two goals down in Amsterdam but looked a different side in the second half after Ajax's Joel Veltman was sent off.
US Open champions Marin Cilic and Serena Williams kicked off their China Open campaigns with straight sets victories against battling underdogs on Monday, but Rafael Nadal suffered defeat in a rare doubles outing on his return from injury.