A Romelu Lukaku hat-trick in a 4-1 win for Everton at Young Boys and a thrilling 3-3 draw between Celtic and Inter Milan.
Unai Emery's side were heading for a demoralising defeat, three days after losing meekly to Sheffield United in the Premier League, but substitute Pepe's late intervention kept the Gunners top of Group F with a maximum nine points.
Cristiano Ronaldo opened the scoring as Juventus beat visiting Bologna 2-1 on Saturday to move four points clear at the top of the Serie A table. Ronaldo struck from close range after 19 minutes, but Danilo levelled for the visitors soon afterwards.
Arjen Robben scored a 90th minute winner in their 2-1 victory at Mainz 05 on Friday to send Bundesliga leaders Bayern Munich into the winter break with a commanding 14-point lead.
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Borussia Dortmund stayed top of the Bundesliga by beating Augsburg 4-3, while titleholders Bayern Munich were thumped 3-0 at home by Borussia Moenchengladbach.
The Bavarians have now won the German league title a record 29 times.
Real Madrid set a Spanish record of 40 matches unbeaten in all competitions after they came back from two goals behind to snatch a 3-3 draw at Sevilla with a last-gasp equaliser from Karim Benzema in the King's Cup on Thursday.
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The carmaker was presenting itself as being run by technological diehards obsessed with building the world's best cars.
Borussia Dortmund scored three times in the last 10 minutes to rally from a goal down and beat 10-man Hoffenheim 3-1 on Sunday, allowing them to maintain their lone pursuit of runaway Bundesliga leaders Bayern Munich.
Arsenal midfielder Aaron Ramsey says he has yet to reach an agreement with the Premier League club about his future. The Wales international, who joined the club in 2008, is in the final year of his contract.
Arturo Vidal and Douglas Costa struck as Bayern Munich disposed of Borussia Moenchengladbach 2-0 on Saturday to claim their first win in three Bundesliga matches and power three points clear at the top.
Borussia Dortmund completed their spectacular implosion this season, losing 2-1 at struggling Werder Bremen.
Two late goals by Everton substitutes brought the Merseysiders a third successive win when they beat Crystal Palace 2-0 at Goodison Park in Sunday's only Premier League game.
Photos from the Champions League matches played across Europe on Tuesday
Czech Republic goalkeeper Petr Cech ended a highly successful 11-year spell at English champions Chelsea when he moved to Premier League rivals Arsenal on Monday.
Portugal coach Fernando Santos left Bernardo Silva, one of the country's brightest young players, out of his final 23-man Euro 2016 squad on Tuesday but included 18-year-old Renato Sanches.
Runaway leaders Bayern Munich appeared to barely break sweat in a 4-0 win at Hanover 96 to chalk up their 14th Bundesliga win in a row on Sunday, leaving them a huge 19 points clear at the top.
Real Madrid are hoping the fit-again Cristiano Ronaldo can lead them into the Champions League final although strike partner Karim Benzema remains a doubt for Wednesday's return match with Manchester City.
Schalke 04 striker Klaas-Jan Huntelaar could not have dreamt of a better comeback after five months out when he scored the opening goal in his side's 3-0 victory at Hamburg SV on Sunday.
Real Madrid suffered an almighty fright before a Cristiano Ronaldo hat-trick hauled them back from 2-1 down and gave them a 4-2 win over rank outsiders Kashima Antlers in the Club World Cup final on Sunday.
Belgium have retained injured Vincent Kompany in their final World Cup squad but put fellow defender Laurent Ciman on standby in case the Manchester City skipper is not fit for their opening match in Russia.
'If you take a point or even lose, it's not ideal but there are still almost 30 games to go so this result won't be the deciding factor in who wins the title'
A round-up of Saturday's action in Serie A, La Liga and Bundesliga.
Klopp is understood to be open to the idea of a move, the reports said, adding that talks between Liverpool and his representatives were progressing well.
Substitute Lukas Podolski grabbed an 81st-minute equaliser to rescue a 2-2 draw for 2014 World Cup winners Germany in an entertaining friendly.
The software could hide the fact that the emission levels of diesel cars were 40 times higher than the level of pollutants allowed in the US.
Holders Bayern Munich struck either side of the break to beat second division Eintracht Braunschweig 2-0 on Wednesday and advance to the German Cup quarter-finals.
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Mueller scores brace in is 200th Bundeliga match
Liverpool's Mohamed Salah is willing to put his Champions League ambitions on the back-burner to help the Merseyside club claim their first English league crown in 29 years, the Egyptian forward has said.
Bundesliga leaders Borussia Dortmund struggled to a 1-1 draw at Nuremberg on Saturday that ended their perfect start to the season of five straight league wins.
Volkswagen overtook Toyota as the world's largest carmaker by sales.
European champions Real Madrid head to rampaging Borussia Dortmund for their Champions League Group F game on Tuesday in a frazzled state with their buoyant start to the season having been punctured by successive La Liga draws.
Draxler makes PSG debut as holders advance into French Cup last 32
Robin Dutt, Indian-origin manager of the German football Bundesliga first division club VfB Stuttgart, has been sacked following the team's relegation from the premier league.
Under-pressure Manchester United manager Louis van Gaal knows losing too many more matches 'could be the end of the world' but said he still has the full backing of the club's board.
On the face of it, Jose Mourinho shouldered the blame for the wounding defeat in his first Manchester derby at Old Trafford on Saturday.
Arjen Robben grabbed his 100th goal for the club as undefeated Bayern Munich outclassed Freiburg 2-0.