America capitalised on a controversial penalty call to beat Leon 1-0 and gain a measure of revenge for last month's Apertura final defeat.
Leon were 5-1 winners over two legs when the two sides last met in December's end-of-season showdown, but America drew first blood in the Clausura campaign on Saturday.
Raul Jimenez was the beneficiary of referee Paul Delgadillo's decision to award a spot-kick after 67 minutes of Sunday's Liga MX clash, even though the striker looked to be outside the box when Nacho Gonzalez made his challenge
Furthermore, the tackle appeared to be a fair one, but Jimenez put that doubt to one side as he stepped up to stroke home what proved to be the winning goal from the spot.
Luis Montes was dismissed for his protests, compounding Leon's misery.
Mauro Formica's goal gave Cruz Azul a 1-0 win at Chiapas as the visitors went joint top of the table with Toluca after three games.
The striker netted after 27 minutes in Sunday's encounter to make it seven points from three matches for Luis Fernando Tena's men.
Toluca rounded off the weekend's action with a 2-0 victory over Pumas UNAM, Pablo Velazquez and Miguel Ponce with the goals.
Tigres UANL finished with nine men in a 2-0 loss at Morelia on Saturday as Juninho and Hernan Burbano saw red.
The damage had already been done, though, as Duvier Riascos and Carlos Morales scored either side of half-time to earn Morelia's first win of the season.
Veracruz managed a 1-1 home draw against Guadalajara despite Cristian Llama's dismissal, which came after Jehu Chiapas had cancelled out Israel Castro's strike for the hosts.
Santos Laguna and Puebla played out a goalless draw in Saturday's other game.
Sunday's action was not nearly as ill-disciplined but the goals flowed at Monterrey as the home side beat Queretaro 3-1.
Willian put the visitors ahead before the break, but Victor Ramos levelled matters early in the second half prior to Marlon de Jesus and Cesar Delgado sealing the points for Monterrey, who are unbeaten after three games.
Pachuca also came from a goal down to claim a home win, recovering from Hernan Pellarno's early strike for Tijuana to triumph 2-1.
Enner Valencia grabbed the equaliser and Walter Ayovi's 74th-minute penalty completed the turnaround.
Atlante recorded their first triumph of the campaign, Narciso Mina's second-half strike proving enough to see off winless Atlas.
|PSG must prove big-club credentials after spending spree - Draxler|
|Not preventing Neymar´s Barca departure a ´bad decision´ - Rakitic|
|Shanghai Shenhua slam ´misleading´ French media over Tevez interview|
|There´s no bitterness – Costa ´cool´ with Conte as Atleti return nears|
|Copa Libertadores Review: River put eight past Wilstermann, Lanus through|
|Ronaldo: I´ll get fit if Real Madrid need me|
|Man United and City have put pressure on Liverpool – Klopp|
|Aubameyang: China talks were a disaster|
|Dembele returns to Barcelona after hamstring surgery|
|EFL set to follow Premier League in transfer window change|
|Howedes a doubt for Juve derby clash|
|It will go well for Dembele at Barca - Aubameyang|
|Abraham denies talk of switch to Nigeria|
|Defensive worries for bullish Klopp as Liverpool eye Leicester revenge|
|Aubameyang: I no longer dream of Real Madrid|
|52 passes, 11 players, one goal, no West Brom touches - Manchester City´s Guardiola masterclass exam|
|Gundogan set for swift Manchester City return|
|Costa´s Atletico return: Griezmann primed to shine alongside Atleti´s prodigal son|
|Time to move on from controversial chant, says Lukaku|
|Costa´s Atletico return: Torres, Aguero, Falcao and Griezmann and the Rojiblancos´ history of fine f|
|Costa´s Atletico return: Bonucci v Allegri, Beckham v Ferguson and more famous player-manager bust-u|
|Kane will stay a long time, regardless of winning trophies - Pochettino|
|I´ll decide who is first choice - Emery putting foot down over Cavani-Neymar penalty spat|
|Costa´s Atletico return: Henry, Tevez, Rooney and other players who went back|
|No celebrations for Barry unless West Brom take something from Arsenal|
|Benzema wants to retire at Real Madrid|
|Atletico Madrid agree Costa deal with Chelsea|
|Only Messi´s dad has signed the contract - Benedito disputes Bartomeu claim|
|Klopp backs Oxlade-Chamberlain and Liverpool to bounce back|
|China won´t compete even in 50 years - Tevez blasts level of Chinese football|
|Record revenues over £580m for Manchester United|
|Ancelotti defends Bayern fitness coach after Neuer injury|
|Burnley sign Lindegaard following Heaton injury|
|Injured Liverpool star Lallana steps up training|
|Juventus can´t stop Dybala leaving, admits Marotta|
|Mertens shrugs off Maradona comparisons after Napoli wondergoal|
|Ramos alarmed by Real Madrid´s ´f****** bad start´ in LaLiga|
|Wenger denies punishing Sanchez with lack of playing time|
|Athletic´s Yeray overcomes cancer for a second time|
|Wenger wanted Barry at Arsenal before Manchester City move|
|Mourinho: Scrapping EFL Cup could help English clubs in Europe|
|Neymar left Barcelona because of Messi – Mathieu|
|Dembele drops hint of early Barcelona return|
|Copa Libertadores Review: Nine-man Barcelona reach semis, Gremio also advance|
|Neville: Rashford as good as Mbappe and Dembele|
|MLS Review: Montreal win derby, Atlanta put four past Galaxy|
|Madrid can overturn deficit as captain Ramos remains calm|
|Neymar wouldn´t have treated Messi like he did Cavani – Forlan|
|Zidane not worried after Madrid lose ground on Barca|
|Casemiro calls for Madrid calm after shock Betis loss|
|Sane sends message to Guardiola as Manchester City shake off West Brom|
|Keep calm and carry on – Allegri backs Higuain to rediscover scoring touch|
|Bosz proud of table-topping Dortmund after Hamburg triumph|
|Montella points to schedule after uninspired Milan win|
|Conte confirms Luiz will be fit to face Atletico|
|Manchester City boss Guardiola hopeful Gundogan injury not serious|
|Real Madrid 0 Real Betis 1: Ronaldo´s return ruined as Sanabria stuns LaLiga champions|
|Wilshere is ready for the league - Wenger|
|Simeone lauds ´different class´ Griezmann|
|Mourinho praises United´s professionalism in EFL Cup win|
|Spurs to host West Ham in EFL Cup fourth round|
|West Brom 1 Manchester City 2: Sane at the double amid fresh Gundogan fears|
|Manchester United 4 Burton Albion 1: Mourinho´s men begin EFL Cup defence in style|
|Arsenal 1 Doncaster Rovers 0: Walcott hits winner for Wenger´s men|
|AC Milan 2 SPAL 0: Penalty double seals comfortable win for Montella´s side|
|Chelsea 5 Nottingham Forest 1: Hazard on form as Batshuayi claims hat-trick|
|Juventus 1 Fiorentina 0: Mandzukic on target as Bianconeri maintain winning start|
|Returning Gundogan limps out of impressive Manchester City return|
|Hamburg 0 Borussia Dortmund 3: Bosz´s men cruise back to Bundesliga summit|
|Athletic Bilbao 1 Atletico Madrid 2: Correa and Carrasco strike in second-half surge|
|I have nothing to prove - Paulinho|
|Prodl pens new four-year Watford contract|
|Monaco renew Subasic, Raggi deals|
|Sampson sacked as England Women´s boss|
|Manchester United to act against ´offensive behaviour´ after Lukaku race row|
|Atletico Madrid´s Wanda Metropolitano to host 2019 Champions League final|
|Chelsea confident of recruitment compliance amid FIFA investigation|
|Brighton seal permanent signing of Newcastle keeper Krul|
|Barcelona condemn Spanish crackdown on Catalonia independence vote|
|Benzema seals Real Madrid stay until 2021|
|Perisic promised Inter can match Manchester United|
|The race is on - Aubameyang lays down Lewandowski challenge|
|Cristiano Ronaldo´s Real Madrid return confirmed|
|Mbappe can prove he´s ready for Madrid at PSG - Morientes|
|PSG ´destroyed the market´ with Neymar and Mbappe - Elber|
|Coutinho withdrawal inspired Leicester to victory, claims Shakespeare|
|Valverde hopes Suarez benefits from Eibar rest|
|Wilshere returning to his best form - Wenger|
|Klopp: Liverpool are still a good football team|
|Pochettino hails ´top player´ Alli|
|Messi from ´another planet´, says Semedo|
|James performance pleases Ancelotti|
|Maestro Messi brings up 300 Camp Nou goals|
|Messi is extraordinary – Valverde hails Barcelona star|
|Inter eyeing Champions League return - Eder|
|Klopp ´sick´ of conceding as Liverpool tumble out of EFL Cup|
|Hodgson urges caution over Souare handling|