West Ham United capitalised on two mistakes from Arsenal's new goalkeeper Petr Cech to claim a surprise 2-0 victory at the Emirates and bring the Gunners' early Premier League optimism down to earth with a bump on Sunday.
England striker Andy Carroll made an immediate impact for new club West Ham United in a 3-0 Premier League demolition of Fulham on Saturday, showing he could prosper in the capital after an ineffective spell with Liverpool.
Newcastle's worries deepened as they now remain at 19th in the table.
Romanians Astra handed West Ham United their first competitive defeat at the London Stadium as Slaven Bilic's team were beaten in the Europa League playoffs on Thursday.
West Ham United manager Sam Allardyce has signed a new two-year contract at the Premier League side, the east London club's co-owner David Gold said on Twitter on Saturday.
Manchester City maintained their squeeze on Arsenal at the top of the Premier League with a 3-0 victory at Crystal Palace on Sunday, a result that keeps Pep Guardiola's side lurking two points behind the leaders and ready to pounce.
Ben Johnson and Tomas Soucek scored second-half goals as West Ham United twice came back from a goal down to earn a 2-2 draw at home to Brighton and Hove Albion in the Premier League on Sunday.
Manchester United loosened Arsenal's grip on the Premier League title race with a 3-2 win in north London on Sunday.
West Ham United's hopes of avoiding relegation suffered a cruel blow as an own goal by midfielder Tomas Soucek and Harry Kane's first goal since December condemned them to a 2-0 defeat at Tottenham Hotspur on Tuesday.
West Ham United manager Slaven Bilic has defended France midfielder Dimitri Payet after Watford players accused him of showboating last Saturday.
Chelsea paid a heavy price for a 3-2 defeat at West Ham United as first Liverpool, then Manchester City, leapfrogged them in the English Premier League title race on Saturday, with City ending the day on top for the first time this season.
Images from Saturday's action in the Premier League.
West Ham United piled more misery on managerless Tottenham Hotspur by coming from behind to book their place in the League Cup semi-finals with a 2-1 win at White Hart Lane and Manchester United also reached the last four on Wednesday.
Angelo Ogbonna leapt high to power home a header in the dying seconds of extra time to claim a timely first goal for the club as West Ham United sank Liverpool 2-1 on Tuesday to reach the last 16 of the FA Cup.
Juan Mata swept home to steer Manchester United into the League Cup quarter-finals with a 1-0 win over holders and bitter local rivals Manchester City on Wednesday as Jose Mourinho got one over old adversary Pep Guardiola.
Adrian fired past opposite number and Spanish compatriot Joel Robles immediately after the Everton keeper had crashed his spot kick against the crossbar as West Ham won 9-8 on penalties.
A summary of Thursday's second leg quarter-final matches in the Europa League.
West Ham United appointed Sam Allardyce as their new manager on Wednesday, the Briton succeeding Avram Grant, who was sacked following the London club's relegation from the Premier League.
Striker Glenn Murray scored a brace and Jose Izquierdo curled in a shot from outside the box to lift promoted Brighton to 10th in the standings, leaving West Ham in 17th just above the relegation zone.
West Ham United edged closer to a Premier League return with a 3-0 home win over Cardiff City on Monday, completing a 5-0 semi-final aggregate triumph to ease into the Championship (second division) playoff final.
Barcelona were shaken up by Eintracht Frankfurt but took a first step in their bid to reach the Europa League last four as a second-half goal by Ferran Torres salvaged a 1-1 comeback away draw in their quarter-final first leg on Thursday.
Manchester United captain Wayne Rooney has apologised to his team mates after being sent off against West Ham United during Saturday's Premier League match following a rash challenge on Stewart Downing.
Fernando Torres scored twice as Liverpool battled to a 3-2 English Premier League win at West Ham United on Saturday after the Londoners had twice pegged them back. Belgian centre back Thomas Vermaelen was a less likely two-goal hero as his double set up Arsenal for a 4-0 home thrashing of Wigan Athletic - emphatically avoiding a hat-trick of defeats after losses to Manchester United and City.
West Ham United midfielder Ravel Morrison has admitted an FA charge of "using abusive and/or insulting words" after a homophobic remark on Twitter, the governing body said.
IMAGES from the EPL matches played on Sunday
Striker Peter Crouch celebrated his 26th birthday by scoring Liverpool's winner in a 2-1 victory at West Ham United that put his side in the thick of the title race.
West Ham United have agreed to sell their ground at Upton Park to London developer Galliard Group once they have moved to the Olympic Stadium in 2016, the club announced on Monday.
Alvaro Negredo grabbed a hat-trick as Manchester City crushed West Ham United 6-0 in their League Cup semi-final first leg on Wednesday in another body blow for the beleaguered London club.
Aston Villa became the latest of the Premier League's top-four challengers to miss an opportunity when they were held to a disappointing goalless draw by West Ham United on Sunday.
West Ham United players are motivated by their position in the Premier League table and they are keen to stay close to the top for as long as possible, manager Slaven Bilic said on Thursday.
Liverpool could be 14th in the table by the time they kick off at West Ham on Sunday afternoon and they will be desperate to steady the ship with three points.
Former Everton, Manchester United and Sunderland manager Moyes, who replaced the sacked Slaven Bilic, has a track record of turning to a good old-fashioned No. 9 to grind out results.
Manchester City got back to winning ways in the Premier League after their derby setback when two goals by Carlos Tevez inspired a 3-1 home victory over the Argentine's former club West Ham United on Monday.
West Ham United moved level on points with sixth-placed Arsenal after being held to a 1-1 draw at home to Stoke City in a dour Premier League clash at Upton Park on Monday.
West Ham United's Mark Noble admitted with rare post-match candour that they were fortunate to escape with a 3-0 defeat by Southampton at the London Stadium on Sunday - their fourth successive reverse in the Premier League.
Tevez said he refused to wear a Brazil shirt in training, a joke punishment handed out by his team mates, and would like to stay at the club if possible.
The east London side suffered a humiliating 2-1 third-round League Cup defeat at the hands of third division Chesterfield to chalk up their eighth defeat in a row.
Chelsea striker Tammy Abraham scored a late opportunist double to secure a 3-0 home win for Chelsea over West Ham United in the English Premier League on Monday.
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.