Urawa Red Diamonds edged past Leon in the Fifa Club World Cup to book a semi-final meeting with Manchester City.
Dutch forward Alex Schalk scored the winner for the Asian champions, five minutes after being introduced as a second-half substitute.
Leon captain William Tesillo was dismissed after picking up a second yellow card late on for the Mexican side, who faded after a bright start.
Japan's Urawa take on European champions City on Tuesday.
Concacaf winners Leon were making their first appearance at the tournament, while Urawa finished third in the competition in 2007 and also participated in 2017.
Al Ahly and Al-Ittihad play later on Friday for the right to face Brazil's Fluminense in the other semi-final, on Monday.
Line-ups
León
Formation 5-4-1
30Cota7MorenoSubstituted forRamírezat 87'minutes21Barreiro22Frías6TesilloBooked at 84mins24RodríguezSubstituted forHernándezat 83'minutes13MenaSubstituted forLópezat 83'minutes29Romero5AmbrízSubstituted forFernándezat 83'minutes20AlvaradoSubstituted forSantosat 90'minutes18ViñasBooked at 77minsSubstitutes
1Blanco3García8Rodríguez9Rubio11Hernández16Fernández17López23Sánchez25Bellón28Ramírez32Santos34VillaUrawa Red Diamonds
Formation 4-2-3-1
1Nishikawa14SekineSubstituted forOgiwaraat 64'minutes28Scholz5Høibråten15AkimotoSubstituted forH Sakaiat 81'minutes3ItoSubstituted forNakajimaat 73'minutes19Iwao21OkuboBooked at 45minsSubstituted forSchalkat 73'minutes25Yasui8Koizumi11KantéSubstitutes
2H Sakai4Iwanami9Linssen10Nakajima16Niekawa17Schalk22Shibato26Ogiwara27Panya30Koroki31Yoshida66OhataReferee:Jean Jacques Ndala Ngambo
Attendance:2,525
Live Text
Match ends, León 0, Urawa Red Diamonds 1.
Second Half ends, León 0, Urawa Red Diamonds 1.
Attempt missed. Federico Viñas (León) header from the centre of the box misses to the right. Assisted by Elías Hernández with a cross.
Attempt blocked. Federico Viñas (León) left footed shot from outside the box is blocked. Assisted by Elías Hernández.
Lucas Romero (León) wins a free kick in the attacking half.
Foul by Shoya Nakajima (Urawa Red Diamonds).
Corner, León. Conceded by Alex Schalk.
Attempt blocked. Adonis Frías (León) right footed shot from outside the box is blocked. Assisted by Stiven Barreiro.
Stiven Barreiro (León) wins a free kick in the attacking half.
Foul by José Kanté (Urawa Red Diamonds).
Substitution, León. Sebastián Santos replaces José Alvarado.
Foul by Lucas Romero (León).
Shoya Nakajima (Urawa Red Diamonds) wins a free kick in the defensive half.
Attempt saved. Alex Schalk (Urawa Red Diamonds) left footed shot from the centre of the box is saved in the centre of the goal. Assisted by José Kanté.
Substitution, León. David Ramírez replaces Iván Moreno.
Corner, Urawa Red Diamonds. Conceded by Nicolás López.
Attempt blocked. Alex Schalk (Urawa Red Diamonds) right footed shot from outside the box is blocked.
Second yellow card to William Tesillo (León) for a bad foul.
Foul by William Tesillo (León).
Alex Schalk (Urawa Red Diamonds) wins a free kick in the attacking half.