Ajax seemed to have the two-legged semifinal wrapped up by halftime after teenage captain Matthijs de Ligt and Hakim Ziyech netted to put it 2-0 up at the break — and 3-0 on aggregate.

But Moura scored twice in a four-minute span to put the visitors one goal from going through 3-3 on aggregate thanks to the away goals rule.

After Jan Vertonghen's header hit the crossbar in the 87th minute, that goal finally arrived when Moura struck again deep into injury time. Dele Alli laid the ball off the Brazilian as he streaked into the area and his low shot crept inside the right post to complete another improbable victory.

"It's impossible to explain what I'm feeling in this moment," Moura said. "We always believed it was possible, and we gave everything on the pitch. I think we deserved this moment."

Moura's winner led to a pile-up of Spurs players by the corner flag celebrating one of the biggest wins in club history, as the disbelieving Ajax players lay on the ground.