Nigeria’s Victor Moses scored the third goal for Chelsea as the former Premiership champions handed a 3-0 defeat to their successors, Leicester City on Saturday.
In the match played at Stamford Bridge, Chelsea got two goals in the first half through Diego Costa and Eden Hazard. The loss was the fourth for the new champions, this season.
In another encounter, Arsenal defeated Swansea City 3-2 to joined Manchester City at the top of the League table with 19 points apiece, after leaders, City, ended their match 1-1 with Everton.
Arsenal introduced Swansea’s new manager, Bob Bradley, the first American to take charge of a top-flight English side, to the harsh realities of Premier League as Arsene Wenger’s men won sixth consecutive league matches.
Walcott struck twice in the space of seven minutes in the first half and almost got a hat-trick, while Mesut Ozil also scored on his 28th birthday.
The draw at the Etihad Stadium ended City’s 100 per cent home record win this season, but the team remained leaders of the league on goal difference.
Manchester City manager, Pep Guardiola, saw his side’s perfect record disappear after Kevin de Bruyne and Sergio Aguero had poor penalties saved by Maarten Stekelenburg in a game the leaders dominated.
City have now missed four of their eight penalties this season. Romelu Lukaku made them pay in between the missed-spot kicks with his sixth goal of the season for Everton before Nolito headed the equalizer.
Tottenham Hotspur, who had started the day in second place, missed a chance to go top, needing an 89th-minute goal from Dele Alli to rescue a 1-1 draw at West Bromwich Albion.
This result ensured that they protected their record as the only unbeaten side in the league.
Tottenham were dominant at the Hawthorns but looked set to lose when their former player, Nacer Chadli, put West Brom ahead in the 82nd minute.
England international Alli, however, ensured Spurs remained unbeaten after the opening eight league matches of the season for the first time since 1990.
They are now one point behind City and Arsenal in third place but Liverpool, who are two points further back, can leapfrog them with a win over Manchester United on Monday.
The battle of the bottom two sides saw Stoke City leave Sunderland stranded at the foot of the table with a 2-0 victory, thanks to the in-form Joe Allen, who struck twice in the first half.
The performance of the day came from Bournemouth, who enjoyed their biggest Premier League win with a 6-1 thrashing of struggling Hull City.