The revamped Club World Cup has not received universal acclaim but an unforgettable last-16 tie will be talked about in all corners of the globe.
Al-Hilal clung on in the first half and were fortunate to only be 1-0 down thanks to goalkeeper Bono's heroics but they recovered to go ahead in the second period.
They were twice pegged back but Marcos Leonardo delivered the decisive blow and once the final whistle was blown, staff and substitutes poured on to the pitch to enjoy the moment with their players.
The joyous Al-Hilal fans, a large cluster of whom were directly behind the dugout, waved the blue flags of the club and the green and white of the country.
Exiting the Camping World Stadium, travelling supporters packed out the concourses, dancing and singing "ole, ole ole ole", while Saudi journalists hugged and kissed each other in the post-match news conference room.
One walked in with wide eyes and arms raised, screaming "Mabrook" in Arabic, translating as "congratulations", almost in disbelief as to what he had witnessed.
It was the first time an Asian club have defeated a side from Europe in an official Fifa tournament. European teams have won 18 of the previous 20 meetings, with two matches drawn.
A journalist from the media outlet Arryadia called the result "one of the biggest in the history of Saudi football" - but added that the country's shock 2-1 win over Argentina at the 2022 World Cup will "always be top".
A lot of money has been spent to try to grow the Saudi game's profile - more than £700m has gone on bringing players to the Pro League, while Portugal great Cristiano Ronaldo's arrival at Al-Nassr two and a half years ago was a significant signing.
Saudi Arabia will also host the 2034 World Cup - a decision that has been defended by Fifa president Gianni Infantino amid significant criticism - with the human rights campaign group Amnesty International describing it as "reckless".
Infantino - the man behind the new 32-team Club World Cup format - has argued that staging the World Cup in the Gulf kingdom can be a catalyst for social improvements.
Saudi Arabia has faced years of scrutiny over its human rights and environmental record. Its World Cup bid was backed by the Football Association in December after it received assurances that all fans would be welcome.
The Saudi bid for the World Cup was unopposed, as Australia - the only other potential candidate - decided not to enter the running, hinting it was futile to do so after being given less than a month by Fifa to mount a challenge.
Fifa stood by a fast-tracked process that critics argued lacked transparency. They suggested it effectively paved the way for the Saudis thanks to a decision that only bids from Asia and Oceania would be considered.
Serbia midfielder Sergej Milinkovic-Savic, who joined Al-Hilal from Lazio in 2023, was asked about the disapproval players have received in leaving Europe for the riches of the Middle East.
"Let's see now if they will criticise us," he said. "We showed them it's not like they are speaking about the league.
"We show against Real Madrid, Salzburg, Pachuca and tonight. I hope we will continue to show it."
Former Chelsea defender Kalidou Koulibaly, who scored in extra time, added: "We knew it would be difficult against one of the best in the world.
"We wanted to show our talents. We are so happy because we wanted to show Al-Hilal had the talent to be here."