Lanus have blasted four first-half goals past River Plate on their way to a 5-1 victory and second spot in the Argentina Primera Division.
Ismael Blanco scored twice for Lanus with both goals set up by Cristian Chavez, who scored the opener, while league-leaders Newell's Old Boys extended their lead at the top of the table with a 3-0 victory away to Atletico Rafaela.
At the Estadio Ciudad de Lanus on Sunday, the home side hit the front after just three minutes with Chavez tapping in the rebound after River Plate goalkeeper Marcelo Barovero had saved Guido Pizarro's initial effort.
River Plate equalised in spectacular fashion in the seventh minute when full-back Leonel Vangioni unleashed a rocket into the top corner but Lanus were ahead again five minutes later through Pizarro before Victor Ayala made it 3-1 in the 14th minute with a drive from the edge of the box.
Lanus continued their brilliant start in the 28th minute with Blanco running onto Chavez's through-ball before blasting his shot past Barovero.
The home side completed the scoring for the match five minutes after half-time as Blanco dinked Chavez's cross over the on-rushing Barovero, with Lanus wrapping up their biggest win over River Plate since the turn of the century.
The victory takes Lanus above River Plate on goal difference with the former rising to second in Argentina's top flight with 32 points and a game in hand on the latter.
Newell's Old Boys tops the division with 38 points after an own goal from Atletico defender Oscar Carniello, plus late strikes from Victor Figueroa and Maximiliano Urruti, earned three points for the pacesetters.
San Lorenzo are fourth on 31 points after a 1-0 win away to Independiente, while bottom club Argentinos Juniors continued their strong month with a 1-0 triumph over Colon.
Argentinos Juniors (15 points) have claimed two wins and two draws in their past four matches to move within a point of second-last Estudiantes, who lost 2-0 to San Martin de San Juan on Saturday.
In other results, Racing Club defeated All Boys 1-0, Tigre completed a scoreless draw with Belgrano, Union Santa Fe drew 1-1 with Velez Sarsfield and Boca Juniors overcame Arsenal 1-0.
Quilmes and Godoy Cruz played out a goalless draw on Tuesday as they both remained in striking distance of the top three.
|18||I. Blanco||28' 50'|
|Coach: Guillermo Barros Schelotto|
for D. González 72'
for G. Pizarro 73'
for S. Romero 80'
|Stanislas brace leads Bournemouth past Yeovil|
|Watford slip to friendly defeat at Cardiff|
|Lukaku injury sours Everton win at Dundee|
|UEFA Champions League Review: Fenerbahce draw blank as Monaco impress|
|West Brom earn friendly win over Walsall|
|Vardy at the double as Leicester beat Burton|
|Atletico impress in win over Oviedo|
|Herrera sacked by Mexico after ´punch´|
|Gerrard, Keane and Bradley pull out of MLS All-Star squad|
|Marseille reach Diaby agreement|
|Sammer thrilled with Vidal´s winning mentality|
|Platini expected to launch FIFA presidency bid|
|Romanov sacked me over Barca snub - Korobochka|
|Villa complete Crespo capture|
|Wolfsberger v Borussia Dortmund: Bender praises ´fun but exhausting´ training|
|Okaka swaps Sampdoria for Anderlecht|
|Southampton v Vitesse: Fonte excited for ´dream´ sojourn into Europe|
|Bournemouth agree King compensation|
|West Ham v Astra: Kouyate confident West Ham can progress|
|Vidal completes Bayern switch, signs four-year deal|
|Fabregas calls for Champions League improvement|
|BREAKING NEWS: Filipe Luis completes Atletico return|
|Bayern to present Vidal|
|Wenger unfazed by Mourinho´s spending jibe|
|Pellegrini: Sterling will justify price tag|
|Cavani hit with two-match Uruguay ban|
|Bonucci to remain at Juve until 2020|
|No bids for Berahino - West Brom|
|Putin: Blatter deserves a Nobel prize|
|Howe: Swansea a benchmark for Bournemouth|
|New Parma to play in Serie D|
|Mata vows to hit the goal trail at United|
|Drogba ´perfect fit´ for Montreal|
|Berahino ´not yet´ ready for Tottenham - Irvine|
|Romero lauds caring Van Gaal|
|Jese flying at Real under Rafa|
|Sampdoria unwilling to pay €10m for Balotelli|
|Mourinho talks up Arsenal title chances|
|Hull sign Ryan Taylor, Sam Clucas|
|Kane, Pochettino hail MLS All-Star test|
|Di Santo sorry for swift Werder departure|
|Mourinho tells Ronaldo: Team honours come first|
|Khedira returns to Juve training|
|Celtic v Qarabag: Champions League return of utmost importance, says Collins|
|Pellegrini: Jovetic had to go|
|Manquillo completes Marseille move|
|Schalke reject Juve´s Draxler bid|
|Blanc: Di Maria deal ´close´|
|Di Santo debut ends in stalemate|
|Fire sign Drogba, trade him to Montreal Impact|
|FIFA and UEFA welcome ruling on third-party ownership|
|Juve kick off title defence against Udinese|
|Stoke sign free agent Afellay|
|Benitez confident Ramos will stay|
|Fenerbahce issue warning to fans|
|UEFA Champions League Preview: De Boer confident Ajax are ready for Vienna test|
|Bility: I am the favourite for FIFA presidency|
|Pienaar to miss start of season|
|Vietnam 1 Manchester City 8: Sterling shines as tourists run riot|
|All-Star Keane relishing Spurs clash|
|Shaun Wright-Phillips joins brother Bradley at Red Bulls|
|Inter 0 Real Madrid 3: Rodriguez stunner caps comfortable win|
|Villa sign Ayew|
|Watford complete Berghuis transfer|
|Robben returns to Bayern training|
|Pulis anxious to make West Brom additions|
|David Luiz eager to welcome ´fantastic´ Di Maria|
|Fernando injury free ahead of new campaign|
|Hummels blames weight issues for poor season|
|Defoe hoping for early Sunderland goals|
|Depay hints at identity of ´surprise´ United striker|
|Tigres UANL v River Plate: Hosts look to bounce back and make history|
|Crespo set for Villa move|
|Terry: I would never join a Premier League rival|
|Van Gaal coy on United future|
|Romero to cover potential De Gea exit - Van Gaal|
|Uruguay win men´s football gold at Pan Am Games|
|Pirlo thanks New York City fans for ´beautiful´ welcome|
|Mexico capitalised on ´the mistakes we made´ - Schafer|
|Herrera delighted with Mexico display|
|MLS Review: Whitecaps build happy home, Pirlo debuts|
|Guardado wins Golden Ball at Gold Cup|
|NZF confirms Olympics disqualification appeal|
|Jamaica 1 Mexico 3: CONCACAF giants complete form turnaround|
|New York Red Bulls 2 Benfica 1: Another scalp for MLS side|
|Romero signs with United|
|Moghreb Tetouan 1 Al Hilal Omdurman 1: Visitors go top|
|Van Gaal rules out Ronaldo bid|