River Plate's Enzo Perez failed from 12 yards to send Al Ain to the Club World Cup final after the last four games had ended 2-2.
Al Ain caused a stir in the Club World Cup on Tuesday, as they eliminated the winners of the Libertadores Cup, River Plate, by penalties in the semifinals.
Nine days after being crowned South American champions for the fourth time, River could not reserve a second appearance in the Club World Cup, since Enzo Pérez lost the decisive point after the match ended 2-2 after 120 minutes .
Rafael Santos Borre gave River hope with a double in the first half to cancel Marcus Berg's starter, the Colombian's corset increased his account to four goals in his last two outings.
After Caio had initiated the procedure, Borre came up twice to grab himself with a "hat-trick". before Gonzalo Martínez saw a penalty on the crossbar.
Perez also failed from 12 yards in a dramatic shootout, which allowed Al Ain to progress by a score of 5-4 after they converted all of their attempts from the point.
Encouraged by his two previous victories in the competition, Al Ain broke the deadlock in the third minute when Berg arrived at his home in a corner on the right with the help of a deviation from Javier Pinola.
However, his advantage did not last long, as Borre leveled things up after Khalid Eisa made a sensational double save to deny both Lucas Pratto and Exequiel Palacios.
Borre doubled his score five minutes later with a composite end after being thrown to the right by Martinez, the 23-year-old who lifts the ball over Eisa's extended right leg.
Hussein Shahat thought he had fired Al Ain's level at halftime only for the VAR to discard it, but Caio's low blow shortly after the restart restored parity: the striker benefits from the river defense loose .
River received a penalty in the 68th minute when Mohamed Ahmad was awarded a foul on Milton Casco, but Martinez could not take advantage since his kick point hit the bar.
Franco Armani denied Ahmad with a save at point-blank range in the final stages of extra time, but it was Eisa who was the hero at the end, jumping to his left to finish a series of nine successful penalties.