Estudiantes and San Lorenzo both won in Argentina's Primera Division to take advantage of Colon's loss and reach the top of the table.
With Lanus knocking off the former leaders 1-0, Estudiantes and San Lorenzo defeated Argentinos Juniors and All Boys respectively to join Colon on 21 points.
Estudiantes edged out Argentinos Juniors 1-0 on Monday thanks to Juan Manuel Olivera's late goal with the La Plata-based club extending their unbeaten run to eight matches.
The advanced midfield trio of Juan Sebastian Veron, Patricio Rodriguez and Joaquin Correa gave Estudiantes the ascendency in the first half, while Argentinos Juniors suffered an early blow away from home when striker Leonardo Pisculichi came off injured in the 21st minute.
The hosts created more genuine goal-scoring opportunities after the break but had to wait until the 80th minute to beat Argentinos Juniors goalkeeper Nereo Fernandez.
Franco Jara's cross from the right found Leonardo Jara, who headed down to Guido Carrillo and although the striker's bicycle kick was saved by Fernandez, Olivera was there to convert the rebound.
The win took Estudiantes to second position in the table with 21 points.
Estudiantes sit above Colon on goal difference but trail San Lorenzo on goals scored.
Colon lost at Lanus on Saturday with Victor Ayala scoring the only goal of the game for the home side in just the second minute.
San Lorenzo claimed the overall lead with a come-from-behind 2-1 triumph at All Boys on Sunday, thanks to late goals from Mauro Matos and Walter Kannemann.
Javier Campora gave All Boys the lead in the first half and, despite some nervous moments after the break, the hosts looked set to hold on for their first win in four matches until San Lorenzo struck with seven minutes remaining.
Nestor Ortigoza produced a pin-point chip over All Boys' defence to find Matos and the substitute finished underneath goalkeeper Nicolas Cambiasso, while in the 88th minute, Kannemann stole victory with a header from Angel Correa's corner.
The top four clubs heading into Round 12 all lost, with Velez Sarsfield (20 points) dropping from second to fourth after going down 1-0 to Racing Club.
River Plate (20) conceded in the 85th minute to lose 2-1 at Belgrano to finish the round in fifth, while Boca Juniors thrashed Godoy Cruz (19) 3-0 to send their opponents to sixth in the table.
The win - Boca's first in five games - took the Buenos Aires giants up to ninth with 18 points, just one point behind eighth-placed Lanus.
In other results in Argentina's top tier, Rosario Central defeated Newell's Old Boys 1-0, Atletico Rafaela drew 2-2 with Quilmes and Tigre won 1-0 at Arsenal.
|5||G. Gil Romero|
|Coach: M. Pellegrino|
for J. Correa 46'
for P. Rodríguez 68'
for F. Jara 88'
|UEFA remove FFP restrictions on Man City and PSG|
|West Brom hope for new owners within the month|
|Chelsea agree loan deal for Falcao|
|Kuyt eyes trophies on Feyenoord return|
|Chile v Argentina: History beckons ahead of Copa America final|
|Wallace extends Monaco loan|
|Mihajlovic wants to instill fear factor at Milan|
|Mignolet improving at Liverpool - Grobbelaar|
|Mumbai City name Anelka player-manager|
|Olivia the parrot predicts Japan to win Women´s World Cup|
|Lusitans coach blasts Bilic´s ´lack of respect´|
|Sakho eyes more Europa League wins|
|Gareca wants Peru to keep building|
|Chile ´no chance´ if Argentina produce their best - Diaz|
|Ocampos joins Marseille permanently|
|Europa League Review: Cloud-nine Brondby ignite opening round|
|West Ham 3 Lusitans 0: Sakho nets twice at start of Europa League journey|
|Holebas makes Watford move|
|Milan secure Adriano signing|
|Peru v Paraguay: Diaz counts cost of semi-final loss|
|Bastia hit out at reports of extra debt|
|Hernandez has successful surgery|
|Odemwingie signs one-year Stoke extension|
|Uth signs for Hoffenheim|
|Henen seals Everton return|
|Cattermole pens long-term Sunderland deal|
|United States v Guatemala: Klinsmann backs Dempsey ahead of Gold Cup warm-up|
|West Ham working on Jenkinson return - Gold|
|Milan agree deal for Bacca|
|Real buy back Vazquez from Espanyol|
|Richards leaves Swansea for Fulham|
|McShane signs for Reading|
|Giggs tells youngsters to seize US chance|
|Hammond pens Leicester extension|
|Only Schweinsteiger can decide Bayern future - Guardiola|
|Cech plans to play until he´s 40|
|Montoya arrives in Milan ahead of Inter move|
|Hernandez out of Gold Cup|
|US asks Switzerland to extradite seven FIFA officials|
|MLS Preview: Sounders seek momentum switch|
|Mexico 0 Honduras 0: Hernandez injury sours friendly|
|Hernandez taken to hospital|
|Garay in doubt for Copa America final|
|Wambach: USA peaking for World Cup final|
|Bassett ´an absolute hero´ despite own goal - Sampson|
|Japan 2 England 1: Late own goal breaks English hearts|
|Salvo quits as Valencia president|
|Costa not Ribery cover - Bayern director Sammer|
|Chile, Argentina deserve final spots - Mena|
|Ramos keen on United switch - Calderon|
|B36 1 The New Saints 2: Wilde leaves it late to secure advantage|
|Sevilla agree deal for Rami|
|Celtic snap up United teenager Janko|
|Beauvue passes Lyon medical|
|Roma bring in Falque|
|Coates completes permanent Sunderland switch|
|Vallecano to make charity donations from shirt sales|
|Angella commits to Watford|
|Gundogan pens new Dortmund deal|
|Juve reject €80million Barca offer for Pogba, says Marotta|
|Ruiz seals permanent Villarreal move|
|Mourinho respects Cech´s decision to quit Chelsea|
|Claridge excited by potential Pearson successors|
|Miranda completes Inter switch|
|Blind takes over as Netherlands coach|
|Mourinho: Premier League tougher to win than ever|
|Hamburg make Holtby move permanent|
|Southampton terminate Osvaldo contract|
|BREAKING NEWS: Swansea swoop for Eder|
|Abbiati extends Milan stay|
|Cruyff: Barcelona have lost their values|
|Vydra seals Watford move|
|Ambitious Clyne targets trophy haul with Liverpool|
|Claridge: Off-field incidents cost Pearson his job|
|Clyne becomes Liverpool´s sixth close-season signing|
|Imbula leaves Marseille for Porto|
|FIFA chief Blatter challenges critics to prove corruption claims|
|Distin joins Bournemouth|
|Bayern seal Costa deal|
|Arsenal confirm Diaby departure|
|Blatter to miss Women´s World Cup final|
|Bogdan sets sights on being Liverpool number one|
|Danilo eager to get started at Real Madrid|
|Leicester´s Wood joins Leeds|
|Porto confirm Atletico move for Martinez|
|Lloyd: Repetition key to netting penalty|
|Sheffield Wednesday job a ´dream´ for Carvalhal|
|´We played a complete game´ - Messi|
|Diaz upbeat despite heavy Copa loss to Argentina|
|Martino lauds Messi for selfless performance|
|Viviani makes surprise Verona switch|
|Estonian team wins cup match 31-0|
|No meeting with Arsenal has occurred - Vidal´s agent|
|United States 2 Germany 0: Ellis´ team reach World Cup final|
|Argentina 6 Paraguay 1: Messi leads Martino´s men to Copa final|
|UEFA Europa League Review: FK Zeljeznicar and FC Dacia Chisinau open with wins|
|UEFA Champions League Review: FC Pyunik make winning start|