Watford equalised seconds before halftime through Abdoulaye Doucoure and in a rampant spell of attacking football went ahead four minutes after the break when Roberto Pereyra tapped home a Richarlison cross.
Tottenham Hotspur and Liverpool raised the spirits with a rip-roaring 2-2 draw in a pre-Christmas Premier League classic on Sunday after a weekend marred by COVID-19 related postponements.
The racist chants took the shine off a great day for Chelsea who have tightened their grip on fourth place.
Chelsea moved within three points of clinching the Premier League title with a 3-0 victory that condemned Middlesbrough to relegation on Monday after goals from Spaniards Diego Costa and Marcos Alonso plus a tap-in by Nemanja Matic.
News of all that's transpired on and off the football field
His first overseas coaching adventure -- Maurizio Sarri has chosen a devilishly difficult league to try and make it happen and a club not exactly known for its patience.
Crowds of cheering French soccer fans began gathering in Paris on Sunday, draped in red, white and blue and singing the Marseillaise, as excitement was building ahead of the France-Croatia showdown at the World Cup final in Moscow.
Much-maligned Olivier Giroud struck twice to help attack-minded France sink Scotland 3-0 in a final warm-up game on Saturday before they launch Euro 2016 on home soil next week.
World Cup: When wingers gave Croatia flight
After playing the most soporific game of the World Cup so far, France will feature in a seismic last-16 clash of former champions with a resurgent Argentina on Saturday, and they will have to drastically improve if they are to stop Lionel Messi.
Jezreel Pannikot reveals life lessons the stars of the 2018 World Cup taught us.
France showed the full range of their attacking weapons as they continued their preparations for the World Cup in convincing fashion with a 3-1 win over Italy in a friendly on Friday.
Trailing 1-0 from the semi-final first leg, Chelsea turned the tie on its head with goals by N'Golo Kante and Eden Hazard in the first half but Fernando Llorente struck for Spurs in an enthralling Stamford Bridge duel.
Tottenham Hotspur gained a slender advantage in their League Cup semi-final against London rivals Chelsea as Harry Kane's penalty earned them a gritty 1-0 first-leg win.
France realise how dangerous Iceland can be from long throw-ins and have been working on ways to counter that weapon when they face the surprise packages of the European Championship in the quarter-finals, coach Didier Deschamps said on Saturday.
Manchester United's Jose Mourinho, humbled for the second time this season in front of the Chelsea fans who once idolised him, did not go quietly on Monday as he declared that he remains the London club's number one manager.
Chelsea kept up their pursuit of the Premier League's top three clubs with a 1-0 win away to London rivals Crystal Palace on Sunday, thanks to a strike by N'Golo Kante early in the second half.
Cristiano Ronaldo and Lionel Messi will again be duelling for the title of world's best footballer after their names once again headed the shortlist on Thursday for The Best FIFA Men's Player.
Buoyant Chelsea extended their Premier League lead and calmed nerves at Stamford Bridge with a 4-2 win over Southampton on Tuesday that moved them seven points clear of their nearest pursuers Tottenham Hotspur.
Chelsea brushed aside London rivals West Ham United with a 2-1 away win that restored their 10-point lead at the top of the Premier League on Monday.
Irresistible Chelsea go into the Christmas round of fixtures knowing they can end the year by re-writing the record books.
European champions Portugal spurned a two-goal lead against Tunisia, stumbling to a 2-2 draw, as France, one of the World Cup favourites, flexed their muscles with a comfortable 2-0 win over Ireland in warm-up friendlies on Monday.
IMAGES from the English Premier League matches played on Sunday
All the action that transpired on and off the football field
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.
Hosts France came from behind to beat 10-man Ireland 2-1 and reach the Euro 2016 quarter-finals after two second-half strikes from forward Antoine Griezmann at Parc OL on Sunday. A tactical switch from coach Didier Deschamps at the break revitalised the French, who struggled to find their feet early on after conceding a Robbie Brady penalty in the second minute, the fastest goal in the 2016 tournament.
Brighton & Hove Albion scored three times in the second half to fight back from two goals down and beat Manchester City
Knee injuries have sidelined him for large parts of this season, however, and the Belgium international has started only four Premier League games.
Late goals from Eden Hazard and Nemanja Matric sealed a 4-2 victory for Chelsea over London rivals Tottenham Hotspur in a rip-roaring FA Cup semi-final at Wembley on Saturday.
Included in Barcelona squad to face Dortmund
Images from Saturday's action in the English Premier League.
The much-anticipated clash between Liverpool and ManchesterCity at Anfield on Saturday looks like a knockout to determine who can challenge Chelsea for the Premier League title.
London clubs' erratic start to the Premier League season improved with victories for Chelsea, Tottenham Hotspur and Arsenal on Saturday but Manchester sides continued to make the running, with City and United the top two.
Images from the UEFA Champions League matches played on Tuesday night.
Chelsea midfielder Cesc Fabregas gave his manager a reminder of his talents by scoring twice in extra time as they fought back from two goals down to knock Premier League champions LeicesterCity out of the League Cup 4-2 on Tuesday.
Chelsea have signed Spanish goalkeeper Kepa Arrizabalaga for a world record 80 million-euro ($92.8 million) fee from Athletic Bilbao, the Premier League club said on Wednesday.
RB Leipzig scored twice in the opening 13 minutes but had to survive a late comeback from Manchester United to cling on to a 3-2 win on Tuesday that sent them into the Champions League knockout stage and eliminated the English side.
Arsenal denied Chelsea the double with a 2-1 victory in an enthralling FA Cup final.
When France meet Portugal in Sunday's Euro 2016 final, the outcome is likely to depend on the performances of Cristiano Ronaldo and Antoine Griezmann -- the second time the two players have clashed with a European trophy at stake in six weeks. Portugal's Ronaldo steered Real Madrid to their Champions League triumph at the end of May after his French rival Griezmann missed a penalty for city rivals Atletico.