Mile Jedinak's second-half penalty was enough for Crystal Palace to see off West Ham 1-0 in the Premier League and equal a club record.
Palace completed a double over their fellow Londoners, having triumphed by the same scoreline at Selhurst Park earlier in the campaign, with a fifth consecutive top-flight win – a run on a par with their previous best mark, set in December 1992.
Jedinak, an ever-present in the league this season, netted his maiden Premier League goal with aplomb after Pablo Armero had fouled Cameron Jerome.
Until that point, West Ham had crafted the clearer openings but centre-forward Andy Carroll passed up chances to press his claims for a place in England's FIFA World Cup squad.
Palace are now mathematically safe from relegation with three games of the season remaining, while West Ham should have already done enough as they lie seven points clear of the bottom three.
Before kick-off, Upton Park paid poignant tribute to young West Ham forward Dylan Tombides – the 20-year-old who died on Friday following a three-year battle with testicular cancer.
Tombides wore squad number 38 and fans later stood to applaud throughout the 38th minute of the match.
West Ham captain Kevin Nolan, back from the hamstring strain that kept him out of the midweek defeat at Arsenal, hooked an eighth-minute cross to the back post where Carroll headed over under pressure from Adrian Mariappa.
Carroll was soon involved at the other end, clearing off the line to deny Kagisho Dikgacoi a first Premier League goal from Yannick Bolasie's corner.
Mariappa, who played in a protective mask having sustained a broken nose in Palace's 3-2 win at Everton last time out, drilled goalwards from a cleverly worked 19th-minute set-piece.
His shot appeared to strike Nolan on the arm, but no penalty was given and referee Martin Atkinson was similarly unmoved after 32 minutes when Jedinak bundled Carroll to the floor.
In between those two incidents, Julian Speroni tipped over a rasping drive from Mohamed Diame and the Crystal Palace goalkeeper superbly denied Diame and Carroll from close range in quick succession as West Ham ended the half on the front foot.
Carroll pulled a 50th-minute shot wide of the near post having collected Stewart Downing's left-wing cross and the striker was then denied by Damien Delaney's last-ditch block.
Yet it was Palace who broke the deadlock from the spot in the 59th minute.
Having survived a penalty claim from Bolasie earlier in the half, Armero was not afforded another reprieve as he sent Jerome clumsily to ground and Jedinak dispatched the resulting penalty emphatically.
The visitors then swarmed forward with intent and wingers Bolasie and Jason Puncheon both had chances to extend Palace's advantage.
A second away goal proved elusive, while West Ham substitute Joe Cole twice blasted off target inside the final 10 minutes, but it was a satisfactory win for Tony Pulis and his team to conclude a week dominated by accusations of team-leaking ahead of their recent win at Cardiff City.
|Coach: S. Allardyce|
for M. Jarvis 70'
for S. Downing 78'
for K. Nolan 85'
|Colombian Primera A Review: Once Caldas go top|
|Venezuelan Primera Division Review: Deportivo Tachira continue unbeaten run|
|Copa Sudamericana Preview: Boca Juniors, River Plate hold narrow leads|
|Uruguayan Primera Division Review: Racing go clear at top|
|Chilean Primera Division Review: President, coach clash doesn´t derail Colo Colo|
|Peruvian Primera Division Review: Melgar, Universitario remain undefeated|
|Brazilian Serie A Review: Sao Paulo beat leaders|
|Paraguayan Division Profesional Review: Nacional Asuncion win again|
|San Jose Earthquakes 1 Los Angeles Galaxy 1: Keane´s penalty miss proves costly|
|Milan progression encourages Inzaghi|
|Ligue 1 Review: Marseille revival continues as Lille stay unbeaten|
|La Liga Review: Valencia continue resurgence, Sevilla ignore goalkeeper crisis|
|Menez thrilled with Milan victory|
|Primeira Liga Review: Porto held at Guimaraes, Boavista claim first win|
|Serie A Review: Goals flow as Inter and Milan both win|
|Parma 4 Milan 5: Visitors triumph in nine-goal thriller|
|Galatasaray v Anderlecht: Unfancied pair meet in Turkey|
|Di Francesco: I would have gladly made 11 changes|
|Liga MX Review: America held by strugglers Universidad, Santos close in on leaders|
|Van Gaal focused on United trajectory|
|Borussia Dortmund v Arsenal: Familiar opponents renew rivalry|
|Championship Preview: Adams talks up Norwich, Wolves head to unbeaten Charlton|
|Bundesliga Review: Hamburg beaten again, Augsburg claim first points|
|Eredivisie Review: Cambuur humble rivals Groningen, Vitesse finally win|
|League Two Preview: Flitcroft urges Bury caution, Burton out to extend lead|
|Benfica v Zenit St. Petersburg: Battle of the high-fliers|
|Redknapp expected heavy United defeat|
|United can do much better, says Van Gaal|
|Benitez at a loss to explain Napoli defeat|
|Manchester United 4 QPR 0: Di Maria steals show on Falcao debut|
|League One Preview: Cotterill demands focus, Dickov bids to ease pressure|
|Monaco v Bayer Leverkusen: Hosts eye positive amid awful start|
|Mazzarri praises ´ideal´ Inter|
|Al Qadsia v Persipura: Kuwaitis seek place in third final|
|Liverpool v Ludogorets: Five-time winners back in the Champions League|
|Real Madrid v Basel: Break from La Liga woes for Ancelotti´s men|
|Inter 7 Sassuolo 0: Icardi hits hat-trick in rout|
|Nottingham Forest 1 Derby County 1: Scrambled equaliser earns visitors a point|
|CSL Review: Henan drop into bottom two after last-gasp equaliser|
|Juventus v Malmo: Allegri´s men aiming to crack Europe|
|Olympiacos v Atletico Madrid: Simeone´s men on crest of a wave|
|K. League Review: Top two earn narrow victories, Sangju Sangmu end winless run|
|Badstuber requires surgery on thigh injury|
|Godin: Our mentality remains|
|Bruce slams ´disrespectful´ Newcastle speculation|
|Pogba confirms Juve talks|
|Gotze expecting improvement at Bayern|
|Mancini interested in Portugal role|
|I was never close to United move - Muller|
|Welbeck impresses Wenger with debut display|
|Mourinho wary of Euro group rivals|
|Rio Ferdinand will never forgive ´biggest idiot´ Terry|
|MLS Review: New England win again, New York held|
|Erbil v Kitchee: Belencoso the key for Molina´s men|
|Al Hilal v Al Ain: Dalic happy with preparation|
|CONCACAF Champions League Preview: In-form Red Bulls travel to Canada|
|Casillas accepts fans´ criticism|
|Primeira Liga Review: Sporting held again, Rio Ave back to summit|
|La Liga Review: Atletico claim bragging rights, Neymar inspires Barca|
|Simeone hails impact of substitutes|
|Serie A Review: Juventus and Roma win ahead of Champions League action|
|Ancelotti vows to ´fix´ Real season|
|Allegri delights in ´special´ home debut|
|Ligue 1 Review: PSG stutter, Saint-Etienne respond|
|Eredivisie Review: AZ lose amid Van Basten confusion, Zwolle halt PSV run|
|Hummels to return to training|
|Hummels to return to training|
|Rodgers to keep faith with new faces|
|Pepe: Real need fans on side|
|Juventus 2 Udinese 0: Tevez and Marchisio seal the points|
|Lambert delighted with tactically terrific Villa|
|Real Madrid 1 Atletico Madrid 2: Arda strike settles derby|
|Bundesliga Review: Kagawa nets on return, Monchengladbach put pressure on Keller|
|Rodgers points to Liverpool tempo trouble|
|Scottish Premiership Review: McIntyre loses on Ross County bow|
|Messi is the best, declare Luis Enrique and Neymar|
|Senderos and Agbonlahor revel in Villa´s Anfield resilience|
|Blanc: We should have settled for 1-0|
|Blanc: We should have settled for 1-0|
|Kagawa: I had goosebumps the entire game|
|League Two Review: Burton extend lead as trio remain winless|
|Lukaku leaves Martinez elated|
|Liverpool 0 Aston Villa 1: Agbonlahor strikes as Villa revel on Merseyside again|
|Irvine rues individual errors|
|Pearson: Cambiasso´s game management is exceptional|
|Koeman: Southampton can improve on Newcastle demolition|
|Hughes eager to restore home comforts|
|Monk positive despite Chelsea defeat|
|Pardew defiant despite heavy defeat|
|League One Review: Bristol City go top, Dons hit five|
|Mourinho tempers Costa expectations|
|Ings hamstring injury to be assessed - Dyche|
|Championship Review: Fulham lose again, Norwich move into second|
|Guardiola hopeful over Badstuber injury|
|Poyet revels in unlikely draw|
|We deserved more - Pochettino|
|Rennes 1 Paris Saint-Germain 1: Ntep clinches point for hosts|
|Warnock hails Speroni after penalty save|
|Barcelona 2 Athletic Bilbao 0: Neymar double makes the difference|
|Southampton 4 Newcastle United 0: Pelle piles pressure on Pardew|
|West Brom 0 Everton 2: Lukaku and Mirallas fire visitors to victory|
|Sunderland 2 Tottenham 2: Kane error ensures spoils are shared|
|Stoke City 0 Leicester City 1: Ulloa continues hot streak in maiden win|
|Chelsea 4 Swansea City 2: Imperious Costa hits three as hosts come from behind|
|Crystal Palace 0 Burnley 0: Arfield miss costs visitors|
|Borussia Dortmund 3 Freiburg 1: Kagawa stars on Dortmund return|
|Bayern Munich 2 Stuttgart 0: Ribery on target in Bayern win|
|Wenger laments poor defending and Debuchy injury|
|Pellegrini fumes at ref Clattenburg|
|Arsenal 2 Manchester City 2: Demichelis header rescues point for visitors|
|J.League Review: Urawa Reds stretch lead as rivals slip up|
|Hull City v West Ham: Hernandez to wait for debut|
|Hughes yet to hold Stoke talks|
|More Britons should play abroad, says Bale|
|Toronto president not expecting Defoe to return|
|I knew I had to change - Sterling|
|MLS Review: Sporting, Sounders claim wins|
|Ferdinand: United shirked farewell|
|Godin: Too difficult to leave Atletico|
|Pellegrini to rotate goalkeepers|
|Atletico not violent - Simeone|
|No Juve injury crisis - Allegri|