A tearful Roger Federer bid goodbye to a 25-year career with defeat at the Laver Cup in a doubles contest that went past midnight in London.
Federer teamed with long-time rival Rafael Nadal against American duo Frances Tiafoe and Jack Sock as Team Europe face Team World at the O2 Arena.
After winning the first set, the Swiss and the Spaniard were faced with a spirited fightback from Tiafoe and Sock, who won a second-set tie-break before also clinching the match tie-break to seal victory 4-6 7-6 (7-2) 11-9.
There had been a great atmosphere in London on Friday for the fifth edition of the three-day competition.
Federer, 41, had not played a match since he was knocked out of Wimbledon by Hubert Hurkacz at the quarter-final stage last year due to knee injury.
There were huge cheers when Federer and Nadal came onto the court and loud roars for the Swiss great when he came up with his first winner.
There was a sensational moment in the first set when Federer appeared to have won a point after his shot hit the top of the net and bounced in, only for a replay to show the ball had somehow been hit through a small hole between the net and the post, meaning Team Europe lost the point, despite the remarkably unlikely event of the ball passing through such a gap.
Novak Djokovic and Andy Murray were among Federer and Nadal's team-mates offering some tactical input between games, and the legendary duo had to save a first break point of the match before the Spaniard held to put them 5-4 up.
It was two of the all-time greats that took a tight opening set when Sock put a volley into the net, prompting Team World captain John McEnroe to tell his doubles pair they appeared to be getting "caught up in the hoopla."
A determined Team World managed to level it up after a back-and-forth second set went to a tie-break, with Tiafoe and Sock coming out on top with their superior power and pace.
That took it to a dramatic deciding match tie-break, with every point keeping fans holding their breath, including some trademark Federer magic at 6-7 when he diverted a Sock shot across court for a crowd-pleasing winner.
It looked like the dream script was being followed as Federer served at match point for himself and Nadal, but the former could only hit a shot into the net, before Sock and Tiafoe won the next two points to secure the win for Team World.
It was then hugs all round as respect was paid to the 20-time grand slam winner at the conclusion of a phenomenal career.
Earlier in the day, Casper Ruud drew first blood for the Team Europe, beating Sock 6-4 5-7 10-7, before Stefanos Tsitsipas doubled their advantage with an emphatic 6-2 6-1 defeat of Diego Schwartzman.
There was drama after the first set of that second singles match when a protester, wearing a T-shirt with the message, "END UK PRIVATE JETS" on, set their arm alight on court before being escorted out by security.
Alex de Minaur then got Team World on the board with a 5-7 6-3 10-7 success over home favourite Murray before the late-night main event under the lights.
Swiatek seals Italian Open hat-trick after soaring past Sabalenka
Iga Swiatek stormed to her third Italian Open title following a dominant 6-2 6-3 victory over Aryna Sabalenka.
The world number one took just under an hour-and-a-half to deny the world number two, and complete a hat-trick of triumphs in Rome.
The pair were contesting a second final in as many events, with Swiatek saving three championship points before eventually prevailing in the Madrid Open showpiece a fortnight ago.
However, it was one-way traffic this time around. The Pole converted two out of three break points as she controlled the opening set.
Sabalenka was the last player to deny Swiatek in a WTA final, that coming at last year's Madrid Open.
Although, the second seed was helpless as her opponent broke again in game seven of the second set, before wrapping up a fourth title of the season ahead of the French Open later this month.
Data debrief
Landing her third Italian Open title before turning 23, Swiatek is only the second player to achieve that feat after Gabriela Sabatini.
In fact, at 22 years and 352 days old, she is the youngest player to win 10 WTA 1000 titles since the introduction of the format in 2009.
The Pole also became the third player to triumph in Madrid and Rome during the same season, after Dinara Safina (2009) and Serena Williams (2013).
Jarry defeats Paul to set up Zverev showdown in Italian Open final
Nicolas Jarry defeated Tommy Paul in three sets on Friday to set up a showdown with Alexander Zverev in the Italian Open final.
The men's world number 24 prevailed 6-3 6-7 (3-7) 6-3 in a little under three hours in Rome to reach his first ATP Masters 1000 final.
Jarry earned the only break of serve in the eighth game of the opening set, but Paul - who dropped just one set in four matches en route to this stage - hit back in the second.
Birthday boy Paul lost serve to trail 4-2 at one stage, but he produced one of the shots of the tournament at the ideal moment and soon dragged it back to 4-4.
A gruelling set concluded with Paul taking the tie-break 7-3, but Jarry was unperturbed and won the deciding set with his fifth match point to see off Paul in a gruelling contest.
Data Debrief:
Jarry is the third male Chilean in the Open Era to reach the singles final of the Italian Open after Marcelo Rios (1997-98) and Fernando Gonzalez (2007).
The 28-year-old registered 13 aces against Paul to his opponent's seven and hit 35 winners to 19 in a deserved victory.
Zverev ends Tabilo's dream run to reach Italian Open final
Alexander Zverev fought back from the brink to reach the Italian Open final on Friday, overcoming Alejandro Tabilo by a 1-6 7-6 (7-4) 6-2 scoreline in the last four.
Zverev was punished for a slow start as Tabilo took the opener within 32 minutes, but the German fought back in a one-hour, 15-minute slog of a second set.
The 2017 Italian Open champion put his foot down from 3-3 in the second-set tie-break, with Tabilo potentially feeling the effects of a fine run that included a last-32 upset of Novak Djokovic.
Zverev upped the intensity in the final set and won a huge 94 per cent of points behind his first serve as his opponent wilted, the third seed reaching the Rome final for a third time.
Data Debrief: Zverev draws level with Becker
Zverev will now face either Nicolas Jarry or Tommy Paul in Sunday's final, which will be his 11th at ATP 1000 Masters level.
That tally pulls him level with Boris Becker for most such finals by a German player since the format's 1990 introduction.
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