Carlos Alcaraz fell to a defeat to fellow youngster Felix Auger-Aliassime in his first match as world number one.

Alcaraz triumphed at the US Open on Sunday, beating Casper Ruud to clinch his first grand slam title and, in the process, become the youngest world number one since the rankings were first published in 1973.

The 19-year-old is the second-youngest male player to win the title at Flushing Meadows in the Open Era, and only the third player since the majors welcomed professionals in 1968 to win the US Open title at his first or second main draw appearance after Arthur Ashe and Rod Laver (in the first two editions of the tournament).

Yet back on home soil in Spain on Friday, Alcaraz was unable to claim victory in his first match since becoming number one, as he went down 6-7 (3-7) 6-4 6-2 to Auger-Aliassime in the Davis Cup Finals.

Canada's Auger-Aliassime did not concede a break point as he dragged his country level in their tie with Spain in Valencia, teeing up a doubles decider after Roberto Bautista Agut defeated Vasek Pospisil 3-6 6-3 6-3.

Auger-Aliassime, 22, has won both of his career matches against Alcaraz, after defeating him in the US Open quarter-finals last year.

Russia have been replaced by Serbia in the Davis Cup and Australia in the Billie Jean King Cup, the International Tennis Federation (ITF) has confirmed.

Russia, who won both competitions in 2021, have been suspended from competing in international team events following the country's invasion of Ukraine.

As the highest-ranked losing semi-finalist from last year, Serbia will take Russia's place in the Davis Cup Finals.

The wild card previously handed to Serbia will now go to one of the 12 nations knocked out in the qualifiers that took place earlier this month.

Likewise, as the highest-ranked side among the 2021 losing Billie Jean King Cup semi-finalists, Australia will replace Russia in that competition.

Australia were due to take part in April's qualifiers, but opponents Slovakia will now receive a bye and advance directly to the Finals.

Belarus have also been barred from competing in both events, meaning Belgium will receive a walkover in their qualifying match and advance to the Billie Jean King Cup Finals.

The Russian Tennis Federation sealed the 2020-21 Davis Cup after beating Croatia 2-0 in the final in Madrid.

Daniil Medvedev and Andrey Rublev secured a third title for the RTF following 7-6 (9-7) 6-2 and 6-4 7-6 (7-5) wins over Marin Cilic and Borna Gojo respectively.

It completed a double for the Russians after Liudmila Samsonova inspired the women's team to glory in the Billie Jean King Cup last month.

Appearing in their first Davis Cup showpiece since 2007, the RTF had lost only two matches during the finals – one of which coming during Saturday's win over Germany with the outcome already decided.

Rublev broke in game seven on the way to taking the opening set against Gojo 6-4.

The world number five was strong on his first serve, winning 36 of 39 points, and drew first blood for his nation after prevailing 9-7 in the second-set tie-break.

US Open champion Medvedev then took on Cilic, who was attempting to keep Croatia's hopes alive in what was their third final in five years.

The world number two's strong serve proved the difference during a tight opening set. Indeed, he hit seven aces on the way to edging his nose in front 9-7 on the tie-break.

Medvedev then broke the world number 30 in game four to take command of the second set.

And a crucial second break followed at 5-2 up to secure a hat-trick of Davis Cup crowns for his nation, who were also victorious in 2002 and 2006.

Andy Murray is looking to give his body time to recover before the end of 2021 after going down to a narrow defeat against Alexander Zverev at the Indian Wells Masters.

Third seed Zverev triumphed 6-4 7-6 (7-4) in a hard-fought third-round battle with Murray on Tuesday.

Three-time grand slam winner Murray had previously defeated Adrian Mannarino and rising star Carlos Alcaraz in California.

He then ran Zverev close, with the German saying afterwards he felt Murray had produced his best performance since returning from hip surgery.

Murray agreed there were positives to take from his run, but was again frustrated not to get a statement win, having also fallen in five sets to Stefanos Tsitsipas at the US Open.

The Briton may play ATP Tour events in Antwerp and Vienna over the next fortnight but is soon eyeing a break that means he will not be putting himself forward for the Davis Cup Finals, which take place over 10 days from the end of November.

Recovering some freshness and spending time with his family are on Murray's agenda ahead of the Australian Open early in 2022.

"I've given a lot to the Davis Cup, and sometimes to my own detriment physically," Murray told BBC Sport after the loss to Zverev.

"The same thing happened last time I played Davis Cup at the end of 2019. I know there was coronavirus, but I was struggling with that really up until September time the following year.

"I also don't feel right now I would be playing, either. Obviously that would be up to [Team GB captain] Leon [Smith], but I'm not sure I deserve to play in that team.

"Right now, I'm not planning on playing the Davis Cup and with the late finish to it, and early departure to Australia, with my schedule between now and the end of the year, I am going to have to rest and take a break and give my body a chance to breathe.

"And I want to make sure in the offseason I get to spend as much time with my family as I can because I have been away from that recently and that will be case when I go to Australia as well."

On the defeat to Zverev, Murray said: "The positive for me to take from it is I had opportunities again.

"I didn't feel like I played a great match and still had chances, so that's positive. But I'm disappointed because I want to be winning these matches. I haven't in the past few months."

Both players forced six break points each and fired down eight aces apiece in an even contest.

Murray broke Zverev three times across the two sets and led in each of them, but ultimately it was the world number four who progressed to book a tie with Gael Monfils in the last 16.

It was the first time Zverev had beaten Murray in three attempts and he has now triumphed against each of the Big Four, with previous wins over Novak Djokovic, Rafael Nadal and Roger Federer to his name.

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