Photos from the World Cup match between Costa Rica and Greece.
Rattled by embarrassing domestic defeats, Chelsea looked jittery before Olivier Giroud settled their nerves with a close range tap-in shortly after halftime at StamfordBridge following good work by N'Golo Kante and Willian in the build-up.
The result leaves Arsenal in fifth place on 15 points, two behind Leicester City and Chelsea, while Sheffield United moved into ninth on 12 points.
Arsenal enjoyed a 3-0 win in Azerbaijan against Qarabag in the Europa League on Thursday and AC Milan beat Greece's Olympiakos Piraeus 3-1 but Sevilla suffered a shock defeat by Russians Krasnodar.
Borussia Dortmund beat Hertha Berlin 3-2 on penalties to reach the German Cup quarter-finals on Wednesday after the match finished 1-1 after extra time.
Unai Emery begins the task of steering Arsenal into a brave new post-Arsene Wenger world.
Germany midfielder Marco Reus scored one goal and set up another in three minutes as Borussia Dortmund survived a late comeback to beat Augsburg 3-2 on Friday and bounce back from an opening Bundesliga defeat last week.
A round-up of Sunday night's matches in the Premier League.
IMAGES from the English Premier League matches played on Sunday
The following are talking points from the weekend's Premier League action:
Bayern Munich beat Borussia Dortmund 4-3 on penalties to win the German Cup for the 18th time on Saturday, handing coach Pep Guardiola another domestic double in his final game in charge.
Champions Bayern Munich opened up an eight-point lead in the Bundesliga at the start of the German season's one-month winter break by beating Hanover 96 1-0 on Saturday amid mounting speculation over the future of coach Pep Guardiola.
IMAGES from the Europa League matches played on Thursday
Arsenal named a strong side captained by Mesut Ozil while Real had Bale on the bench and Eden Hazard, wearing the number 50 shirt, starting alongside fellow new signing Luka Jovic in attack.
City have 89 points, one more than rivals Liverpool, with both teams having three games to play -- and none of them against top six opponents.
Striker Robert Lewandowski scored a second-half hat-trick as Borussia Dortmund reclaimed top spot in the Bundesliga with an awe-inspiring 6-1 demolition of VfB Stuttgart on Friday.
Images from Sunday's Premier League matches.
Bundesliga leaders Bayern Munich face Borussia Dortmund on Saturday with relations between the German heavyweights seemingly at an all-time low.
High drama ensued during the English Premier League matches on Wednesday as Spurs manager Jose Mourinho was booked while Brighton stunned Chelsea via Alireza Jahanbakhsh's superb equaliser to deny the Blues victory. Here is all the EPL action in IMAGES from Wednesday's matches.
The home team's record signing Jefferson Lerma, who cost 25 million pounds ($32 million) in August, scored a spectacular own goal to give Arsenal the lead but Norwegian international Josh King, back in the Bournemouth side after injury, equalised just before halftime.
Bayern Munich humiliated former Bundesliga powerhouses Werder Bremen 7-0 on Saturday with Franck Ribery scoring twice and setting up another two as the champions kept up their seemingly unstoppable march towards another title.
The victory moved second-placed Bayern, who take on Celtic in the Champions League next week, up to 17 points, two behind Dortmund who suffered their first home loss in 41 league matches.
Croatia edged closer to next year's World Cup with an emphatic 4-1 home win over Greece on Thursday in the first leg of their two-legged playoff.
IMAGES from Saturday's English Premier League matches.
Juventus scored twice in a minute as they came from behind to clinch a dramatic 3-2 win over Olympiakos after Andrea Pirlo had celebrated his 100th Champions League appearance by scoring from a characteristically effortless free kick on Tuesday.
News of all that's transpired on and off the football field
A summary of Tuesday's group matches in the UEFA Champions League.
Schuerrle hits treble for the world champs; Lewandowski helps Poland thrash Georgia