Rafael Nadal's loss to Frances Tiafoe opened up a host of possibilities including a first-time world number one and maiden grand slam winner as the top three's domination of men's singles continues to weaken.
World number three Nadal bowed out in the fourth round to 22nd seed Tiafoe 6-4 4-6 6-4 6-3 on Monday, while third seed Alcaraz triumphed over Marin Cilic 6-4 3-6 6-4 4-6 6-3 in a match that went to almost 2:30am local time.
Cilic was the last remaining male player with a grand slam title to his name, meaning this year's US Open will bring a new major champion.
There may also be a first-time world number one too, with Alcaraz guaranteed to claim the top rank if he wins the US Open title.
Fifth seed Casper Ruud will rise to world number one if he lifts the US Open crown at Flushing Meadows on September 11 too.
If both fall short of the final, Nadal will reclaim the top ranking from 2021 US Open champion Daniil Medvedev, who lost in the fourth round to Nick Kyrgios.
Alcaraz could also scale the rankings summit should he reach the final, assuming Ruud misses out.
Sinner and Berrettini send defending champions Italy into Davis Cup final
Jannik Sinner's victory over Alex de Minaur clinched Italy's place in another Davis Cup final, with Matteo Berrettini also victorious as the defending champions beat Australia 2-0.
Italy won the Davis Cup for the first time since 1976 last year, and they will have an opportunity to defend their crown against the Netherlands on Sunday.
Former Wimbledon finalist Berrettini got the ball rolling with an entertaining 6-7 (6-8) 6-3 7-5 victory over Thanasi Kokkinakis, not surrendering a break after losing the opener in a tie-break.
That teed up Sinner to close out Italy's victory, with the world number one overcoming De Minaur 6-3 6-4, the same scoreline he beat the Australian by at the ATP Finals earlier this month.
Speaking after his victory in Malaga, Sinner said: "It means a lot. It was a tough encounter, playing Alex. We know each other quite well now, so I have to be very careful every time.
"It's a very tough challenge for me, so I was looking forward to this one. Obviously, it helped a lot that Matteo won the singles today. He played amazing tennis. It was very high quality.
"Hopefully, this can give us some confidence for [Sunday]. It's going to be a very difficult and tough day for us and also the Netherlands."
Data Debrief: Back-to-back for Italy
Italy's men are looking to follow in the footsteps of their female counterparts, who won the Billie Jean King Cup earlier this week.
They are just the third nation in history to make back-to-back finals at both the Davis Cup and the Federation/Billie Jean King Cup, after the United States (1963-64, 1978-79, 1981-82 and 1990-91) and Australia (1963-64 and 1964-65).
Djokovic appoints Murray as coach for Australian Open
Novak Djokovic has announced his long-term former rival Andy Murray as his coach for the Australian Open in 2025.
Murray, a three-time Grand Slam winner, announced his retirement earlier this year and played his final match at the Paris Olympics in August.
He will join Djokovic's team in the off-season and coach him through the opening grand slam of the year, which begins on January 12.
This will be Murray's first coaching role since retiring following a 19-year career.
"We played each other since we were boys. 25 years of being rivals, of pushing each other beyond our limits," Djokovic said in a video on social media.
"We had some of the most epic battles in our sport. They called us game changers, risk-takers, history makers.
"I thought our story may be over - turns out it has one final chapter.
"It's time for one of my toughest opponents to step into my corner. Welcome onboard coach, Andy Murray."
Djokovic failed to win a major title for the first time since 2017, though he did clinch a long-awaited Olympic gold medal in Paris.
The Serb is currently level with Margaret Court for the most major singles titles by any player. He has a good record in Australia though, winning 10 times in Melbourne, beating Murray in four of those finals.
Murray, who beat Djokovic to win the US Open title in 2012 and Wimbledon the following year, says he hopes they can achieve success together.
"I'm going to be joining Novak's team in the off-season, helping him to prepare for the Australian Open," Murray said.
"I'm really excited for it and looking forward to spending time on the same side of the net as Novak for a change, helping him to achieve his goals."
Girona 4-1 Espanyol: Miovski bags double as hosts ride on first-half blitz
Bojan Miovski scored twice as Girona thrashed Espanyol 4-1 in LaLiga at Estadi Municipal de Montilivi on Saturday.
Bryan Gil and Ladislav Krejci were also on the scoresheet as the home side raced to a 4-0 lead inside the first half hour, with Javi Puado scoring the visiting side's only goal after the break.
After the match was halted because of a fan being taken ill in the crowd, Gil opened the scoring when he unleashed a stunning long-range strike into the bottom corner with four minutes on the clock.
Gil was behind the second goal for Michel's side too, as he capitalised on a defensive error and crossed to Miovski, who made it 2-0 in the 16th minute before the pair combined again for a third five minutes later.
Donny van de Beek's header from Yaser Asprilla's corner was pushed in by Krejci for Girona's fourth in the 27th minute.
Espanyol got a consolation goal 10 minutes into the second half when Puado hit a long-range strike that found the back of Paulo Gazzaniga's net.
Girona, last season's surprise package, climbed to fifth in LaLiga with 21 points, while Espanyol are 19th and in the relegation zone with 10 points.
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