Bernardo Silva netted a late equaliser as Monaco left CSKA Moscow with a 1-1 draw after on-loan forward Lacina Traore looked to have got the better of his parent club.
Real Madrid continued their resurgence with a 5-1 win over Legia Warsaw at the Bernabeu.
Atletico Madrid took a major step towards the last 16 of the Champions League with a 1-0 win over German champions Bayern Munich at the Vicente Calderon.
Gerard Pique claimed the winner as Barcelona came from behind to beat Borussia Monchengladbach and claim a second successive victory in Group C of the Champions League.
Edinson Cavani scored twice as Paris St Germain secured their first win of this season's Champions League with a 3-1 victory against Ludogorets.
Theo Walcott's purple-patch continued as he scored a first-half brace in Arsenal's Champions League victory over Basle at the Emirates Stadium on Wednesday night.
Manchester City came from behind three times to draw 3-3 with Celtic in a breathtaking Champions League encounter at Parkhead.
Napoli scored three times inside eight second-half minutes as they beat Benfica 4-2 to record a second successive victory in Group B of the Champions League.
Wissam Ben Yedder's second-half goal gave Sevilla a 1-0 home win over Lyon in Champions League Group H on Tuesday.
Sporting Lisbon are up and running in the Champions League after defeating Legia Warsaw 2-0 at the Estadio Jose Alvalade.
An excellent shot deep into second-half stoppage from Kamil Glik rescued a 1-1 draw for Monaco at home to Bayer Leverkusen.
Miralem Pjanic scored one and set up another for Gonzalo Higuain before Paulo Dybala's scorcher as Juventus conquered Dinamo Zagreb 4-0.
Son Heung-Min scored a crucial goal for Tottenham Hotspur as they came out 1-0 winners against CSKA Moscow in Champions League Group E.
Andre Schurrle scored three minutes from time to help Borussia Dortmund salvage a late 2-2 draw at home against Real Madrid in Champions League Group F on Tuesday.
Islam Slimani was the hero as Leicester made it two wins out of two in the Champions League by beating Porto 1-0 at the King Power Stadium.
Borussia Dortmund demolished Legia Warsaw in Poland as half-a-dozen different players found the net in a 6-0 Champions League rout.
Rampant Leicester marked their Champions League debut in stunning style as they thrashed Club Brugge 3-0.
Tottenham's Champions League campaign began in disappointment as an English club-record home crowd watched them beaten 2-1 by Monaco at Wembley.
Sergio Aguero scored his second hat trick of the season as Manchester City overpowered Borussia Monchengladbach 4-0 in their delayed Champions League Group C opener.
Juventus were frustrated by a stubborn Sevilla side in Turin as the 2015 Champions League finalists started this year's campaign with a 0-0 draw.
Substitute Alvaro Morata struck deep into injury-time to seal a stunning Champions League comeback for holders Real Madrid at the Bernabeu on Wednesday night.
Lionel Messi helped give Celtic another harsh Champions League lesson with a hat trick as Barcelona thrashed the Hoops 7-0 in their Group C opener at the Nou Camp.
Midfielder Joshua Kimmich continued his goal rush as he claimed a double in Bayern Munich's 5-0 Champions League demolition of FC Rostov.
Manchester City's Champions League game against Borussia Monchengladbach, postponed because of torrential rain, will be played on Wednesday evening at 7:45 p.m. BST.
Atletico Madrid's bid to reach a third Champions League final in four years got off to a winning start with a hard-fought 1-0 victory over PSV Eindhoven.
Arkadiusz Milik was Napoli's hero as they came from behind to beat 10-man Dynamo Kiev 2-1 in Ukraine.
Alexis Sanchez scored in the second half to help Arsenal salvage a 1-1 draw at Paris Saint-Germain, who were left to rue multiple missed chances after scoring in the first minute of their Champions League opener.
Pep Guardiola will return to the Camp Nou after Manchester City and Barcelona were drawn together in the Champions League group stage on Thursday.
Manchester City sealed their place in the Champions League group stage with a comfortable 6-0 aggregate victory over Steaua Bucharest in the playoff round on Wednesday night, and will be in pot 2 for Thursday's draw.
Rostov eliminated Ajax to reach the group stage with a 4-1 rout to claim a 5-2 aggregate win overall.
Late goals by central defenders Jose Gimenez and Diego Godin earned Atletico Madrid a 2-0 victory over Juventus in their Champions League round-of-16 first leg at the Wanda Metropolitano, amid more video assistant referee (VAR) controversy.
Late goals from Leroy Sane and Raheem Sterling gave Manchester City a 3-2 win at Schalke 04 in their Champions League round of 16 first leg on Wednesday that put the English side in the driving seat.
Liverpool and Bayern Munich cancelled each other out to draw 0-0 in the first leg of their Champions League round-of-16 clash on a tense night at Anfield.
Barcelona were held to a frustrating 0-0 draw at Olympique Lyonnais in their Champions League last-16 first leg on Tuesday as both sides remained unbeaten in this season's competition.
Marco Asensio scored a late winner for Real Madrid in a 2-1 victory at Ajax Amsterdam, who were left to rue a goal disallowed by the video assistant referee (VAR) in their Champions League round-of-16 first leg on Wednesday.
Tottenham Hotspur will take a commanding lead to the Westfalenstadion next month after beating Borussia Dortmund 3-0 in the first leg of their Champions League round-of-16 clash at Wembley.
Goals from Presnel Kimpembe and Kylian Mbappe left Manchester United with a mountain to climb as Paris Saint-Germain won 2-0 at Old Trafford in the Champions League round-of-16 first leg and Paul Pogba was sent off.
Teenager Nicolo Zaniolo scored a quick-fire double to earn AS Roma a 2-1 win against Porto in their Champions League last-16 first leg on Tuesday.
Manchester United will face Paris Saint-Germain in the Champions League round of 16, while Liverpool have been drawn against Bayern Munich.
Manchester City battled back to winning ways, coming from a goal down to overwhelm Hoffenheim 2-1 in the Champions League with a brilliant Leroy Sane double that ensured they progressed to the last-16 as winners of Group F on Wednesday.
Manchester United endured an undignified end to their topsy-turvy Champions League group stage campaign by losing 2-1 at already-eliminated Valencia on Wednesday and missing their chance of topping Group H.
Olympique Lyonnais earned the point they required to book their place in the Champions League last 16 but needed Nabil Fekir's equaliser 20 minutes into the second half to salvage a 1-1 draw away to Shakhtar Donetsk.
Two goals from striker Guillaume Hoarau led Young Boys to a shock 2-1 Champions League win over already-qualified Juventus on Wednesday to hand the Serie A side their first away defeat in a competitive match for over a year.
Striker Robert Lewandowski scored twice as Bayern Munich sealed top spot in Group E following a thrilling 3-3 Champions League draw at Ajax in which both sides ended with 10 men.
Benfica finished its Champions League campaign with a 1-0 win over AEK Athens on Wednesday.
Real Madrid suffered their heaviest ever home defeat in Europe on Wednesday when the already-qualified Spaniards were thumped 3-0 at the Santiago Bernabeu by CSKA Moscow in the Champions League.
Viktoria Plzen beat struggling Roma 2-1 in the Champions League on Wednesday to earn a Europa League spot.
Tottenham Hotspur made it into the round of 16 of the Champions League, coming from behind to grab a 1-1 draw at Barcelona on Tuesday which saw them finish second in Group B at the expense of Inter Milan.
Paris Saint-Germain reached the round of 16 of the Champions League on Tuesday thanks to an inspired performance by their three-pronged attack of Neymar, Edinson Cavani and Kylian Mbappe in a 4-1 win at Red Star Belgrade.
Inter Milan were knocked out of the Champions League after they could only manage a 1-1 draw at home to Group B's bottom club PSV Eindhoven on Tuesday to finish third behind Tottenham Hotspur.
Mohamed Salah's first-half strike gave Liverpool a 1-0 win over Napoli in Champions League Group C action on Tuesday.
An under-strength Borussia Dortmund deepened AS Monaco's season-long misery on Tuesday with a 2-0 away victory that ensured they finished top of Champions League Group A ahead of Atletico Madrid.
Atletico Madrid were denied top place in Group A of the Champions League on Tuesday after a goalless draw away at Club Brugge in Belgium meant they finished second behind Borussia Dortmund.
Alessandro Schoepf's stoppage time goal gave Schalke 04 a 1-0 win over Lokomotiv Moscow in Champions League Group D action on Tuesday.
Porto struggled to a 3-2 away victory over Galatasaray in their final Champions League group match on Tuesday but the Turks stayed third in Group D and secured a spot in the Europa League's round of 32.
Real Madrid midfielder Luka Modric has ended the Cristiano Ronaldo-Lionel Messi stranglehold on the Ballon d'Or.
Two first-half goals gave Paris Saint-Germain a crucial 2-1 Champions League home win over Liverpool, putting them in a great position to qualify and leaving Jurgen Klopp's side, finalists last season, in danger of elimination.
Napoli swept aside Red Star Belgrade with a typically entertaining performance as two goals from Dries Mertens helped them to a 3-1 win over the former European champions in their Champions League match on Wednesday.
Borussia Dortmund booked their spot in the Champions League knockout stage with a game to spare after a goalless draw against visitors Club Brugge in Group A on Wednesday.
Christian Eriksen kept Tottenham Hotspur's hopes of reaching the round of 16 in the Champions League alive when he came off the bench to score a late winner in his side's 1-0 victory over Inter Milan at Wembley on Wednesday.