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'
|MLS Review: Altidore scores as Toronto move top in east, Galaxy rally|
|CONCACAF Champions League Review: Tigres win, Dallas held|
|Victory lure Rojas back to Melbourne|
|Chaplow suspended two games for verbal abuse, denies homophobia|
|Eduardo farewells Dinamo Zagreb amid Chelsea speculation|
|Zidane shoud give James more respect - Asprilla|
|Solo suspended from USA women´s team for six months|
|Guardiola understands fans unhappiness over Hart situation|
|Burnley and Middlesbrough sent packing from League Cup|
|Coleman baffled by Ramsey´s treatment at Arsenal|
|Six of the best for Gladbach as Rostov rout Ajax|
|Leicester face Chelsea, Northampton host United in League Cup third round|
|Cillessen set to fly out to Barca to complete move|
|Guardiola hails ´legend´ Hart as Bravo wait in the wings|
|Emotional Hart edges towards City exit|
|Manchester City 1 Steaua Bucharest 0 (6-0 agg): City ease through amid Hart-felt goodbyes|
|Ronaldo working hard for Madrid return|
|Pique warns of European Super League dangers|
|AFC Champions League: Damjanovic inspires Seoul, Wanderley puts Al Nasr in charge|
|Rauball re-elected as German league president|
|Cillessen returns for Ajax despite Barcelona talk|
|Surgery for Pereira after De Rossi horror challenge|
|Hart set for City farewell against Steaua|
|CAF Champions League Review: Wydad draw at ZESCO to earn top spot|
|Retiring Keane in Republic of Ireland squad for final time|
|Sion in talks to sign Liverpool outcast Balotelli, claims club president|
|Athletic´s Laporte not distracted by Barcelona visit|
|Keane announces international retirement|
|Clarke named FA chairman|
|Neuer: Schweinsteiger remains one of world´s best|
|Bielsa would call me before coming to Marseille - Passi|
|Watford bring in Janmaat from Newcastle|
|FIFA opens adjudicatory proceedings against disgraced African football officials|
|European Super League could cause ´war´|
|Sampdoria pounce for Praet|
|Zaza agent confirms Napoli talks but rules out loan move|
|No Grigg in Northern Ireland´s World Cup qualifying squad|
|Cahill reflects on ´amazing´ Melbourne City debut|
|Europa League must take priority, Recoba tells Inter|
|Saint-Etienne swoop for Saivet and Veretout|
|Ronaldo: Pepe was the best player at the Euros, not Griezmann|
|Schweinsteiger: Manchester United my last club in Europe|
|Dante sees Nice as a positive move|
|Pique: Barcelona by far the best in Spain|
|Pique backs Stones for success under Pep|
|Coleman dismisses Premier League talk|
|Spurs want Calhanoglu, claims agent|
|Bony an ´option´ for Bilic|
|Leverkusen cannot challenge Bayern, says Ballack|
|Pallotta blasts ´disgusting´ referee after Roma defeat|
|Badstuber taking his time after injury nightmare|
|Conte: Terry return between him and Allardyce|
|We beat Bayern to Dembele - Watzke|
|Wanderers bring back Bulut|
|Moyes rules out Kone exit|
|CONCACAF Champions League Review: Whitecaps, Pachuca win big|
|Bale: I´ll never forget this year|
|Griezmann: I deserve Best Player in Europe Award|
|No surgery for Ayew as West Ham target December return|
|Villarreal did all they could to make it through - Escriba|
|Spalletti rues lack of Roma discipline|
|Conte: Chelsea must learn to kill matches|
|Watford and West Brom crash out of League Cup|
|My longest 90 minutes as a coach - Rodgers|
|AFC Champions League: Goalless draws leave quarter-finals on a knife edge|
|Klopp hopeful over Can injury|
|Champions League play-offs: Nine-man Roma crash out as Monaco edge Villarreal|
|Henderson hails ´outstanding´ Mane after Burton thrashing|
|Chelsea 3 Bristol Rovers 2: Conte´s side survive scare thanks to Batshuayi double|
|Hapoel Be´er Sheva 2 Celtic 0 (4-5 agg): Visitors survive Israeli scare|
|Burton Albion 0 Liverpool 5: Sturridge at the double in Reds rout|
|Leverkusen sign Austria star Dragovic|
|Sakho in the clear as WADA opt against appeal|
|Enyimba 3 Mamelodi Sundowns 1: Udoh brace secures CAF Champions League win|
|Pulisic and Ramos on target as Dortmund wrap up Bundesliga preparations|
|Calleri hoping for Tevez advice|
|Defour hoping for Belgium recall|
|Alaba warns against complacency as Bayern begin Bundesliga defence|
|Bravo arrives in Manchester ahead of City move|
|Dyche backs Gray after striker´s apology for homophobic tweets|
|Gray charged by FA over homophobic tweets|
|Pique: Olympic gold proves Neymar is one of world´s best|
|Marin makes Olympiacos move|
|Zidane arrival the catalyst for one of my best seasons - Ronaldo|
|Moyes ´worried´ about Mannone elbow injury|
|Sidibe rejected Arsenal over playing-time fears|
|Guardiola: Toure could feature against Steaua|
|Hernandez out for two weeks after falling down stairs|
|Bravo nearing City move, admits Guardiola|
|Ballack impressed by Dortmund signings but still backing Bayern|
|Lucescu questions De Boer tactics|
|Milan reject Chelsea bid for Romagnoli|
|Dortmund know how to treat Gotze - Ballack|
|Shevchenko: Bacca must improve consistency|
|´If you heed 100 idiots you will go crazy´ - Bauza on Messi return|
|Valdano relieved over Messi U-turn|
|Nordfeldt in line for loan move after signing fresh Swans deal|
|Dante joins Nice from Wolfsburg|
|De Boer expects fierce fight for Barca number-one spot|
|Newell´s confident over Messi return|
|Stoke confirm Jones interest|
|MLS ´attractive´ to Rooney - Timbers owner|
|Burke re-signs with West Ham|
|Sassuolo rejected Balotelli - CEO|
|Valencia coach Ayestaran rules out Mustafi sale|
|Allardyce plans Guardiola talks over Hart|
|Cahill warns rivals over City attack|
|Allardyce open to Terry England return|
|Drogba dismisses Villa rumours|
|Tuchel pleased despite Dortmund wastefulness|