Racing Club and Velez Sarsfield preserved their perfect starts to the Argentina Primera Division, while Boca Juniors left it late.
Luciano Lollo and Facundo Castillon were on target as the 10 men of Racing Club upstaged Copa Libertadores champions San Lorenzo 2-0 on matchday two on Sunday.
It was a similar story for Velez Sarsfield, who accounted for Arsenal 2-1 courtesy of Lucas Pratto and Ivan Marcone's own goal.
Racing Club and Velez Sarsfield are the only two teams to have won their opening two games and sit two points clear atop the table in Argentina.
Godoy Cruz, River Plate and Newell's Old Boys are all locked on four points.
Godoy Cruz scored two goals in the final three minutes to salvage a 2-2 draw at Quilmes, River Plate downed Rosario Central 2-0 and Newell's Old Boys drew 1-1 with Gimnasia La Plata.
San Lorenzo were crowned champions of South America last week after they defeated Paraguayan outfit Nacional to win the Copa Libertadores for the first time.
But San Lorenzo, who had their opening game rescheduled due to cup commitments, were given a wake-up call as Racing Club emerged triumphant at the Estadio Presidente Juan Domingo Peron.
Just as the half was set to end all-square, defender Lollo - a new recruit from rivals Belgrano - popped up to open the scoring in the 45th minute, rising highest to head the ball beyond goalkeeper Sebastian Torrico.
The home side were reduced to 10 men in the 80th minute after striker Gabriel Hauche was shown a straight red card but despite their numerical disadvantage, Racing Club sealed the points in the second minute of additional time thanks to substitute Castillon, who turned his defender and lofted the ball over Torrico.
At the Estadio Jose Amalfitani, Velez Sarsfield wrapped up proceedings inside an hour against Arsenal.
Pratto got the ball rolling in the sixth minute after tucking away a rebound from close range.
The home side went two goals ahead 11 minutes into the second half thanks to Arsenal defender Marcone, who bundled the ball into his own net.
Arsenal striker Emilio Zelaya did poke home a goal in injury time but it was nothing more than a consolation.
Emmanuel Gigliotti netted a 90th-minute winner as Boca Juniors overcame Belgrano 1-0 on Sunday.
Boca Juniors lost their opening match but an unmarked Gigliotti directed his header past Juan Olave in the third minute of added time to give the 30-time champions their first win of the season.
In other results, an 84th-minute own goal from Gaspar Servio handed Defensa y Justicia a 3-2 win over Banfield.
Jonathan Blanco converted two first-half penalties as Olimpo defeated Tigre 2-1.
Estudiantes were 1-0 winners at home to Independiente, while Atletico Rafaela prevailed 2-1 against Lanus.
|Coach: D. Cocca|
for M. Acuña 64'
for D. Milito 73'
for G. Díaz 89'
|FA Cup quarter-final replays scrapped|
|Cantona suggests Deschamps dropped Ben Arfa and Benzema over race|
|Depay ´p***** off´ at lack of football|
|Ferdinand welcomes Mourinho to Manchester United|
|Delph placed on England standby list|
|Wales talisman Bale shrugs off Euro pressure|
|Ronaldo open to working under Mourinho again|
|Ronaldo values Champions League over Barcelona´s double|
|Switzerland v Belgium: Shaqiri eyes Euro glory|
|Willian: Manchester United stronger with Mourinho|
|Liverpool and Dortmund in for Guerreiro|
|Real Madrid will attack Atletico again, says Ancelotti|
|Ramirez set for Southampton exit|
|Bale calls for cool Madrid heads|
|´Mourinho can take United back to the top´ - Ibrahimovic hints at Old Trafford switch|
|Hull City v Sheffield Wednesday: Promotion windfall the prize on offer|
|Lahm eyes Champions League glory with Ancelotti|
|Juventus chief hints at Dani Alves deal|
|Gotze warned he will not be first choice under Ancelotti|
|Courtois: If nothing strange happens, I will continue at Chelsea|
|Vermaelen ´disappointed´ by Barca struggles|
|Higuain and Lamela dream of lifting the Copa America|
|Reborn Torres returns to Milan to complete Atletico´s greatest tale|
|Lukaku offers Everton ultimatum: I want to win trophies!|
|United States v Bolivia: Copa America hosts to fine-tune preparations|
|Zidane has united Real Madrid again - Ramos|
|Mexico v Paraguay: Marquez ready to make the most of ´great opportunity´|
|Republic of Ireland v Netherlands Preview: O'Neill wants confident display|
|Coyle leaves Houston Dynamo|
|McLaren could end Mercedes dominance - Alonso|
|United States 1 Ecuador 0: Last-gasp Nagbe goal lifts hosts in Copa America warm-up|
|Orlando City 2 Philadelphia Union 2: Tribbett rescues point in controversial contest|
|Djourou compares Xhaka to Pirlo|
|Gallas ´very proud´ of former boss Ranieri´s title glory|
|Copa America to use goal-line technology|
|Smith likens Postecoglou to Klopp|
|Hart backs Sterling to shine at Euro 2016|
|Giovinco happy in MLS despite Euro 2016 snub|
|Balotelli set for Liverpool return, confirms Berlusconi|
|Atletico must win Champions League - Cerezo|
|Arbeloa: Mourinho didn´t get enough recognition at Madrid|
|Mijatovic: Bale can save Madrid´s season in Champions League final|
|Gallas expects Conte to revive Chelsea|
|Deschamps ´annoyed, but not worried´ by Varane´s absence|
|´Impossible´ to see MSN leaving Barcelona - Bartomeu|
|Thiago pledges future to Bayern|
|AFC Champions League Review: Urawa pay the penalty as Seoul advance|
|Uruguay v Trinidad and Tobago: Sanchez skips final to help Suarez-less La Celeste|
|Benitez ´convinced´ he can win trophies at Newcastle|
|Nigeria v Mali: Moses among many absentees for hosts|
|Nigeria v Mali: Moses among many absentees for Super Eagles|
|Benitez to stay at Newcastle|
|Kramaric leaves Leicester for Hoffenheim permanently|
|Neustadter gets green light for Russia Euro 2016 selection|
|Chile v Jamaica: Copa plans crystallize in Vina del Mar|
|Ledley making progress in bid to prove Euro 2016 fitness|
|Gotze returns to Germany training|
|Ronaldo: Madrid would be smart to give me a new deal|
|Northern Ireland v Belarus: Last chance to impress as O'Neill prepares to trim squad|
|Varane disappointed by Euros absence|
|Republic of Ireland v Netherlands: O´Neill wants confident display|
|Ronaldo shakes off injury in Real Madrid training|
|Atletico star Griezmann ´listening to different clubs´|
|United States - Ecuador Preview: Klinsmann pins hopes on Yedlin as Copa preparations continue|
|Gold tells Middlesbrough to ´dream on´ over Antonio|
|Schweinsteiger wants Mourinho to spice up Manchester derby|
|England v Australia: All eyes on Rashford debut|
|Aggressive Premier League better for me - Xhaka|
|Schweinsteiger ´right on schedule´ for Euro 2016|
|Darmian relishing Euros after return from injury|
|Northern Ireland v Belarus: Last chance to impress as O´Neill prepares to trim squad|
|Ventura leaves Torino amid Italy talk, Mihajlovic appointed|
|Sevilla confident of keeping Emery|
|Godin wants Atletico to use 2014 defeat as inspiration|
|Xhaka agrees Arsenal move|
|Idolisation of Ibrahimovic warranted Sweden captaincy - Hamren|
|Scholes hopes Mourinho keeps Giggs at Manchester United|
|Gotze snubbing Liverpool will boost Germany - Bierhoff|
|Bosz honoured by Ajax appointment|
|Ramos highlights Griezmann threat|
|Record-chasing Ronaldo and taming the Wolves - Real Madrid´s route to the Champions League final|
|Donnarumma dreams of being Milan captain|
|Koke: History, not revenge motivating Atletico|
|Costa Rica v Venezuela: Hosts ramp up preparations for maiden Copa America tilt|
|Argentina v Honduras: Messi and co warm up for Copa America|
|USA will win a World Cup, says Donovan|
|Pumas UNAM 2 Independiente del Valle 1 (3-3 agg, 3-5 on penalties): Hosts suffer shoot-out heartbrea|
|Gracia leaves Malaga as Rubin Kazan loom|
|Messi: Argentina deserve to be Copa America champions|
|Dybala included in Argentina´s preliminary Olympics squad|
|Mourinho and United a ´good wedding´ - Ancelotti|
|Klinsmann: Copa America better than Euros|
|Messi: Joining Barcelona not an easy decision|
|Carrico receives four-game ban for homophobic slur|
|Dani Alves wants Atletico to win Champions League|
|McNair out to impress ´world-class´ Mourinho|
|Ranieri: Premier League survival is Leicester´s priority next season|
|Argentina forward Lavezzi suffers hamstring scare|
|Koeman talks ´very positive´, say Southampton|
|Rami replaces injured Varane in France´s Euro 2016 squad|
|Matthaus applauds Gotze for rejecting ´easy solution´ of Liverpool|
|Suarez silenced his doubters - De Boer|
|AFC Champions League Review: Jeonbuk, Shanghai SIPG progress|
|Klopp can take Liverpool right to the top, says McAllister|
|Lindelof happy at Benfica amid Real Madrid, Barcelona links|
|Zidane is perfect on and off the pitch - Lippi|
|Bale: Zidane has brought the best out of Real Madrid|
|Favre takes over as Puel and Nice part ways|
|Liverpool complete Karius deal|
|Van Gaal was treated poorly by United, but Mourinho will be a success - De Boer|
|Dani Alves: I have won more titles than Pele|
|I know who I´m taking - Conte sure on Euro 2016 selection|
|Xavi backs Guardiola to ´change the face of English football´|
|Lucescu appointed Zenit boss|
|Manchester United and Liverpool hit with €40,000 fines|
|Weinzierl: I have nothing to lose at Schalke|
|Rangers complete Barton signing|
|Italy better placed as underdogs ahead of Euro´s - Motta|
|Cantona: I love Mourinho, but he is not Manchester United|
|Ben Arfa wants Lyon move - Aulas|
|David Silva praises Iniesta´s Copa del Rey heroics|
|´It was a little scare´ - Ronaldo plays down injury fears|
|Eder the real deal for Lille|
|Van Gaal treated unfairly during Manchester United spell - Daley Blind|
|Ginola doing ´very well´ after heart surgery|
|Depay rules out Manchester United exit following Van Gaal departure|
|Hojbjerg confirms desire to leave Bayern|
|Ronaldo leaves Madrid training early after knock|
|Abbiati unimpressed with Milan players´ attitude|
|Pepe calls on Madrid to continue making history|
|Ayestaran signs two-year deal with Valencia|
|Montolivo, Antonelli sign new AC Milan contracts|
|Ronaldo ready for UCL final after being rested from practice match|
|Hummels, Sanches deals will not stop Bayern spending - Rummenigge|
|Oblak´s penalty heroics, Griezmann´s Barcelona brace - Atletico Madrid´s route to the Champions Leag|
|Salvio all but confirms Gaitan will join Atletico Madrid|
|Motta warns PSG over Ronaldo, Neymar interest|
|Europa League Mourinho´s best hope for United trophy - Sheringham|
|Injustice if Iniesta never wins a Ballon d´Or - Del Bosque|
|Van Gaal didn´t deserve United sacking - Blind|
|I´ll be happy if we make Euro 2016 semi-finals - Del Bosque|
|Koke: Why would I want to leave Atletico?|
|Fofana could retire aged 25 - Lyon president|
|Sandro set to leave Barcelona|
|Silva plays down injury worries ahead of Euro 2016|
|United would be brave to appoint Mourinho, says Schmeichel|
|Neymar adamant he is happy at Barcelona|
|Wilshere: Arsenal play me out of position|
|Ryan backs former coach Neville|
|Keane talks up Galaxy move for Ronaldo|
|´Free agent´ Diarra wants Mourinho reunion|