Emma Raducanu and Carlos Alcaraz might have lost in the revamped US Open mixed doubles - but they certainly won the hearts of the New York crowd.

In a party-like atmosphere at Arthur Ashe Stadium, Britain's Raducanu and Spain's Alcaraz saw their chances of claiming a $1 million winning prize ended by fellow Briton Jack Draper and Jessica Pegula.

Despite the presence of home player Pegula, it was the losing pair who were heavily backed by a sizeable crowd at Flushing Meadows.

Pegula and Draper won 4-2, 4-2 in the new shortened format, which is part of the US Open's "reimagination" of the mixed doubles.

As well as the huge financial incentives, the event has also been moved forward to the week before the singles main draws to attract the stars.

Raducanu and Alcaraz teaming up for the glamorous event - which has controversially deviated from its traditional format and polarised opinion - created many of the pre-tournament headlines.

There was a fear they might not turn out at all, given Alcaraz played in the final of an ATP event in Cincinnati on Monday.

But the pair walked out together on the US Open's main show court, little over 24 hours later, to a euphoric reception of screams and shouts.

An excitable atmosphere continued as the fans - who paid between $25 (£18.50) and $145 (£107) for what British doubles player Jamie Murray described as a "glorified exhibition" - danced to tunes played by an on-court DJ and acted up when appearing on the big screen.

Both sets of players smiled and laughed throughout, further illustrating how the stars are using the event to tune up for their greater priority of the singles.

For some, it underlined the view of the doubles specialists sidelined that a Grand Slam tournament had lost value.

Pegula, who has been ranked world number one in the women's doubles, and Draper were also a scratch pairing but had too much quality against a pair who are less experienced in tour-level doubles.

For Draper, it was third time lucky - having seen previous planned partners Zheng Qinwen and Paula Badosa withdraw through injury.

Pegula and Draper will play Russia's Mirra Andreeva and Daniil Medvedev in the last eight after they beat Serbia's Olga Danilovic and Novak Djokovic.

There was the loss of one star name before Tuesday's play started, when men's world number one Jannik Sinner withdrew through illness.

'We're playing for all the doubles players not here'

When the news about the US Open's plans emerged in February, reigning mixed doubles champions Sara Errani and Andrea Vavussori labelled the decision "a profound injustice".

Their thoughts have since been echoed by many doubles specialists, who also gripe about losing a crucial earning opportunity after being pushed out in favour of the stars.

Errani and Vavussori were eventually given a wildcard to play in the 16-team event, but were the only specialist doubles pairing in the draw.

The Italian pair opened the day's play on Louis Armstrong Stadium - the second show court at Flushing Meadows - and competed like they had a point to prove.

Passionate roars were loud and clear throughout their 4-2 4-2 opening win over big-name pairing Elena Rybakina and Taylor Fritz.

More emotion was shown when they reached Wednesday's semi-finals with a 4-1 5-4 (7-4) victory against Karolina Muchova and Andrey Rublev.

"We're also playing for all the doubles players that could not be here, so we tried to do our best," said Vavassori.

Six-time Grand Slam singles champion Iga Swiatek and Casper Ruud, a three-time major finalist, also reached Wednesday's last four.