Late goals from Sergi Roberto and Luis Suarez saved Barcelona's blushes and earned them a valuable win over visitors Bayer Leverkusen in Champions League Group E.
Robert Lewandowski's incredible goal scoring form continued as the striker's hat trick helped Bayern Munich thrash Dinamo Zagreb 5-0.
Belarusian champions BATE Borisov shocked Italian side Roma with a 3-2 win at the Borisov-Arena in Champions League Group E.
Valencia got their Champions League campaign up and running with a 1-0 victory at Lyon in Group H.
Oleg Shatov's second-half goal earned Zenit St Petersburg a 2-1 Champions League victory over Gent at the Petrovsky Stadium on Tuesday night to strengthen their position at the top of Group H.
Goals from Andriy Yarmolenko and Aluisio Junior Moraes gave Dynamo Kiev a 2-0 Champions League victory over Maccabi Tel-Aviv in Group G.
Champions League holders Barcelona saw their perfect start to the season ended after they were held to a 1-1 draw by Roma at the Stadio Olimpico in Wednesday's Group E opener.
Diego Costa scored his first Champions League goal for Chelsea as the beleaguered Premier League champions claimed a much-needed fillip by thrashing Maccabi Tel Aviv at Stamford Bridge.
Arsenal had striker Olivier Giroud sent off as they slumped to a disappointing 2-1 defeat in their Champions League Group F opener at Dinamo Zagreb.
Thomas Muller's scoring streak continued as he netted a brace to steer Bayern Munich to a 3-0 win at Olympiakos in their Champions League Group F opener.
Hakan Calhanoglu scored a brace either side of Javier Hernandez's first goal for Bayer Leverkusen as the German side made a winning start in Champions League Group E by seeing off BATE Borisov 4-1 at home.
Zenit St Petersburg got their Champions League campaign off to a winning start as they recorded a 3-2 victory at Valencia in Wednesday's Group H opener.
Gent fought back to clinch a point in a heroic display after having two men sent off in their first ever Champions League group match which ended 1-1 against Lyon.
Luke Shaw suffered a horrific suspected broken leg as Manchester United's return to the Champions League ended in a disappointing 2-1 defeat to PSV Eindhoven.
Manchester City suffered familiar European wobbles as they surrendered a lead to lose their Champions League Group D opener 2-1 to Juventus.
Cristiano Ronaldo hit a second-half hat trick as Real Madrid opened their Champions League campaign with a 4-0 victory over 10-man Shakhtar Donetsk in Tuesday's Group A showdown at the Santiago Bernabeu.
Angel Di Maria opened his account for Paris Saint-Germain as they began their Champions League Group A campaign with a 2-0 victory over Malmo.
Sevilla scored two second-half penalties and missed another as they defeated Borussia Monchengladbach 3-0 in their opening Champions League group-stage clash.
Antoine Griezmann struck twice in the first half as Atletico Madrid made an ideal start to their Champions League campaign with a 2-0 victory at Galatasaray.
Benfica opened their Champions League campaign with a 2-0 victory over group stage new boys Astana in Lisbon.
Julian Draxler's first-half goal made the difference for Wolfsburg in their Champions League clash against CSKA Moscow at the Volkswagen Arena.
Manchester City have been handed a tough Champions League Group stage draw against Juventus, Sevilla and Borussia Monchengladbach.
Lionel Messi was named the UEFA Best Player in Europe for the 2014-15 season for helping Barcelona to a Treble of trophies.
Manchester United advanced to the Champions League group stages as Wayne Rooney netted a hat trick to help beat Club Brugge 4-0 in Belgium to advance 7-1 on aggregate.
Valencia lost 2-1 at Monaco but advanced from their Champions League playoff on an aggregate 4-3 score Tuesday, giving Spain a record five teams in the group stage.
Celtic's Champions League hopes ended amid some controversy as a 2-0 defeat by Malmo at the Swedbank Stadion put the Swedish side through to the group stages on a 4-3 aggregate victory.
Ukraine's Shakhtar Donetsk overcame a rocky start to qualify for the Champions League group stage on Tuesday, drawing 2-2 with Austrian side Rapid Vienna for a 3-2 aggregate win.
Leigh Griffiths scored twice as Celtic defeated FC Malmo 3-2 in their UEFA Champions League playoff first leg at Celtic Park on Wednesday.
Memphis Depay helped spare Manchester United's blushes as his first goals for the club inspired them to come from behind to defeat Club Brugge 3-1 in their Champions League playoff first leg.
Pedro shrugged off rampant speculation over his future to score the winner in extra time and help Barcelona lift the UEFA Super Cup on Tuesday with a 5-4 win over Sevilla.
Lorenzo Insigne's late winner gave Napoli a deserved 1-0 Champions League victory over Liverpool on Wednesday that saw the Italians move to the top of Group C.
Mauro Icardi took advantage of an error from PSV Eindhoven goalkeeper Jeroen Zoet to gift Inter Milan a 2-1 victory in their Champions League Group B clash on Wednesday.
Borussia Dortmund's blistering start to the season under manager Lucien Favre gathered momentum as the Bundesliga leaders consigned ailing Monaco to a 3-0 defeat in the Champions League on Wednesday.
Antoine Griezmann had a goal in each half -- including the 8,000th Champions League goal -- and Koke also scored in added time to lead Atletico Madrid to a 3-1 win over Club Brugge on Wednesday.
A second-half header by Moussa Marega gave Porto a 1-0 Champions League win over Galatasaray at home on Wednesday.
Lionel Messi scored twice and powered Barcelona to a 4-2 win against Tottenham in Champions League Group B at Wembley Stadium on Wednesday night.
United States international Weston McKennie's late header gave Schalke a 1-0 win over Lokomotiv Moscow in the Champions League on Wednesday as they continued to recover from a poor start to the season.
Neymar scored his second Champions League hat trick as Paris Saint-Germain rolled to a 6-1 victory over Red Star Belgrade in a Champions League group-stage game at the Parc des Princes on Wednesday.
Roma's Edin Dzeko was again the tormentor for Viktoria Plzen as he scored a hat trick in a 5-0 Champions League Group G win for the Italian side on Tuesday.
Manchester United's dismal run of form continued as they were held to a 0-0 draw by Valencia in a drab Champions League clash at Old Trafford.
Lyon produced a stirring fightback to claw back two superb goals from Shakhtar Donetsk's Junior Moraes and rescue a 2-2 draw behind closed doors in a thrilling end-to-end contest at their Groupama Stadium on Tuesday.
A depleted Real Madrid suffered a shock 1-0 Champions League defeat at CSKA Moscow on Tuesday, extending a poor run of form for the holders that has left them without a win in three games.
Benfica played the entire second half with 10 men and squandered a two-goal lead before claiming a thrilling 3-2 win away to AEK Athens in Champions League Group E action on Tuesday.
Full-back Noussair Mazraoui earned a youthful Ajax side a 1-1 draw at misfiring Bayern Munich in their Champions League Group E clash at the Allianz Arena on Tuesday.
Paulo Dybala hit a hat-trick as Juventus maintained their 100% record in the Champions League courtesy of a 3-0 win against BSC Young Boys.
David Silva nipped in to secure a late 2-1 victory for Premier League champions Manchester City at Hoffenheim.
Cristiano Ronaldo's Champions League debut for Juventus lasted only 29 minutes as he was red-carded but the Italians began their Group H campaign impressively with a 2-0 victory at Valencia on Wednesday.
Paul Pogba scored two first-half goals as Manchester United spoiled Young Boys' first appearance in the group stage of the Champions League by cruising to a comfortable 3-0 victory at the Stade de Suisse on Wednesday.
Manchester City looked far from potential Champions League winners as they fell to a surprise 2-1 loss at home to Olympique Lyonnais on Wednesday with a flat performance that leaves them with plenty of work to do to progress from Group F.
CSKA Moscow salvaged a 2-2 draw with Viktoria Plzen in the Champions League on Wednesday after a penalty deep in stoppage time.
Bayern Munich midfielder Renato Sanches had a goal and an assist in his return to Benfica in a 2-0 victory on Wednesday.
Real Madrid rode goals from Isco and Gareth Bale to a 3-0 win against Roma in their Champions League Group G opener at the Camp Nou on Wednesday.
The youngest coach in Champions League history drew his debut game Wednesday as Hoffenheim's match at Shakhtar Donetsk finished 2-2.
Nicolas Tagliafico scored two second-half goals as Ajax marked their return to the Champions League group stages with a 3-0 victory over AEK Athens on Wednesday.
A stoppage-time goal from Roberto Firmino gave Liverpool a 3-2 win over Paris Saint-Germain on a dramatic Champions League night at Anfield.
Red Star Belgrade ground out a 0-0 home draw against Napoli on the Serbian side's Champions League debut as their goalkeeper Milan Borjan made a flurry of telling saves in a pulsating Group C clash on Tuesday.
Borussia Dortmund's United States forward Christian Pulisic came off the bench to grab a late goal for a 1-0 Champions League Group A victory over Club Brugge on Tuesday.
Atletico Madrid battled their way back from a goal down to pull off a confidence-boosting 2-1 win at AS Monaco in Champions League Group A on Tuesday, with a defiant response to their troubling start to the domestic season.
Inter Milan scored two late goals as they came from 1-0 down to beat Tottenham Hotspur 2-1 in a dramatic Champions League clash at the San Siro.
Lionel Messi scored a record-setting hat trick as Barcelona opened their Champions League campaign in Group B with an impressive 4-0 win against PSV Eindhoven at the Camp Nou.