The first leg fixtures of the 2014/15 UEFA Champions League Round of 16 were completed on Wednesday night which saw Monaco produce an upset win over Arsenal.
The French side, under Leonardo Jardim, sprung a surprise 3-1 victory over Arsene Wenger's Gunners at the Emirates Stadium to confidently set up a return bout at home on March 17.
Goals from Geoffrey Kondogbia and Dimitar Berbatov preceded Alex Oxlade-Chamberlain's injury-time response before Yannick Ferreira-Carrasco heaped a little more misery on the north Londoners with a third goal at the death.
In Wednesday night's other fixture, Bayer Leverkusen overcame ten-man Atletico Madrid 1-0 at the BayArena.
Turkey international Hakan Calhanoglu produced a stunning angled finish in the 57th minute before Atletico's Tiago was sent off for a second yellow card in the 76th minute giving the German side a slight advantage going into the return leg at the Vicente Calderon.
Tuesday night saw Barcelona edge Manchester City 2-1 at the Etihad Stadium courtesy of a first-half brace from Luis Suarez but the deficit was reduced when Sergio Aguero struck with just over 20 minutes remaining prior to Gael Clichy's 74th-minute sending off.
Lionel Messi saw a late penalty saved by Joe Hart before missing the follow-up header which set up what could be a tantalizing affair at the Camp Nou in three weeks' time.
Italian champions Juventus gave themselves a slender lead by getting the better of Borussia Dortmund 2-1 in Turin with Carlos Tevez and Alvaro Morata netting either side of Marco Reus' 18th-minute leveler.
Last week, FC Basel and FC Porto drew 1-1 in Switzerland as German behemoth Bayern Munich were held to a 0-0 draw by Ukraine's Shakhtar Donetsk.
Chelsea produced a satisfying 1-1 draw with Paris Saint-Germain at Parc des Princes which saw Edinson Cavani cancel out Branislav Ivanovic's opener while Real Madrid took another step towards defending their European title by beating Schalke 2-0 in Gelsenkirchen thanks to goals from Cristiano Ronaldo and Marcelo.
The return legs will take place on March 10-11 and 17-18 to determined which eight clubs move through to the quarter-finals of Europe's premier club competition.
2014/15 UEFA Champions League - Round of 16 first leg scores
Paris Saint-Germain (FRA): 1 (Edinson Cavani 54') Chelsea (ENG): 1 (Branislav Ivanovic 36') Parc des Princes, Paris, France - 46,146
Shakhtar Donetsk (UKR): 0 Bayern Munich (GER): 0 (red card: Xabi Alonso 65') Arena, Lviv, Ukraine - 34,187
Schalke (GER): 0 Real Madrid (SPN): 2 (Cristiano Ronaldo 26', Marcelo 79') Veltins-Arena, Gelsenkirchen, Germany - 54,442
FC Basel (SUI): 1 (Derlis Gonzalez 11') FC Porto (POR): 1 (Danilo (p) 79') St Jakob-Park, Basel, Switzerland - 34,464
Manchester City: 1 (Sergio Aguero 69', red card: Gael Clichy 74') Barcelona (SPN): 2 (Luis Suarez 16'/30') Etihad Stadium, Manchester, England - 45,081
Juventus (ITA): 2 (Carlos Tevez 13', Alvaro Morata 43') Borussia Dortmund (GER): 1 (Marco Reus 18') Juventus Stadium, Turin, Italy - 41,182
Bayer Leverkusen (GER): 1 (Hakan Calhanoglu 57') Atletico Madrid (SPN): 0 (red card: Tiago 76') BayArena, Leverkusen, Germany - 29,079
Arsenal (ENG): 1 (Alex Oxlade-Chamberlain 90+1') Monaco (FRA): 3 (Geoffrey Kondogbia 38', Dimitar Berbatov 53', Yannick Ferreira-Carrasco 90+4') Emirates Stadium, London, England - 59,868
