Alexei Popyrin (Russian: Алексей Попырин; born 5 August 1999) is an Australian professional tennis player.

[9] At the age of 8, Popyrin relocated to Dubai for two years due to his father's work commitments before moving to Alicante, Spain, where fellow Australian Alex de Minaur was his neighbour.

In the same year he competed in the Tennis Europe u12 circuit, winning the Stork International 12 & Under in Oetwil Am See (SUI), Torneo U12 – Porto San Giorgio in Porto San Giorgio (ITA),[16] Torneo Citta Di Padova in Padova (ITA).

Popyrin lost in the semi-finals at the Eddie Herr International Junior Tennis Championships – IMG / Bollettieri Sports Academy Bradenton, FL (USA), Passagespoirs Le Passage (FRA), as well as the final of the Campionati Internazionali BNL d'Italia U12 – Circolo Canottieri in Roma (ITA).

[17] He then followed that up by winning 22 consecutive matches winning 4 consecutive tournaments : the Mediterranee Avenir – Club Olympic Casablancais Casablanca (MAR), Trofeo Bonfiglio – Tennis Club Milano Milan (ITA), the 2017 French Open junior singles title in May 2017 and his first ITF Professional tournament in Poland F4 Futures Mragowo (POL).

[18] Popyrin entered his first ITF Futures professional tournament in October 2013 at 14 years of age where he lost a first round qualifying match to Slovakian Martin Beran in Madrid.

In July 2016, he secured his first professional main draw win in an Italian ITF Futures tournament by defeating local talent Tommaso Roggero in straight sets before retiring hurt in the second round.

Popyrin continued to play ITF Futures tournaments for the remainder of 2016 and ended the year with a world ranking of No.

In January 2018, he qualified for an ATP World Tour tournament for the first time at the Sydney International beating Nicolas Mahut and Federico Delbonis.

In October, Popyrin qualified for his second ATP World Tour main draw at the Stockholm Open, where he again lost to John Millman in round one.

The following week, Popyrin again qualified for a main draw, this time at Swiss Indoors beating Benoit Paire and Mackenzie McDonald.

He also received a wildcard in the Australian Open, and achieved his first Grand Slam win by defeating Mischa Zverev in straight sets.

Popyrin followed this up by beating Dominic Thiem and lost in the third round to Lucas Pouille in closely contested five sets.

Following his success on the ATP tour, Popyrin was awarded a main draw wildcard into French Open.

In the first round Popyrin defeated France's Ugo Humbert in four sets winning his first Roland Garros men's main draw match.

In the same month, Popyrin received his first direct acceptance into ATP 250 tournament in Atlanta, where he lost in the quarterfinals.

In February, Popyrin entered the Singapore Open and defeated Marin Čilić in the semi-final and Alexander Bublik in the final to win his first ATP title and achieved a career high singles ranking of 82.

Making it through qualifying at the Open du Pays d'Aix, he was defeated in the first round by fifth seed Pablo Cuevas.

Popyrin won his second ATP Challenger Tour title at the BNP Paribas Primrose Bordeaux with a win over sixth seed Quentin Halys in the final.

[41] Playing as a wildcard at his home slam, the Australian Open, he stunned eighth seed and world No.

[46] However, due to the withdrawal of Kwon Soon-woo, Popyrin entered the main draw as a lucky loser.

[56] Making it past qualifying on his debut at the Italian Open, he earned his fifth Top 10 win of his career by upsetting world No.

In Surbiton, he lost in the first round of the singles to Luke Saville, but made the semi-finals of the doubles, partnering Aleksandar Vukic.

[62] At the Qatar Open, he reached the semi-finals defeating wildcard Abdullah Shelbayh, qualifier Hugo Grenier and fourth seed Alexander Bublik.

Popyrin notably defeated the defending champion and sixth seed Andrey Rublev in the second round of the 2024 Monte-Carlo Masters, taking it in straight sets, his second career top 10 win on clay.

Together with Alex de Minaur, they became the first Australians to reach the third round in Monte Carlo since Lleyton Hewitt and Wayne Arthurs in 2004.

[63] He made his debut at the 2024 Summer Olympics in Paris where he reached the third round with wins over Nicolás Jarry and Stan Wawrinka.

[67][68] At the US Open, Popyrin reached the fourth round of a Grand Slam for the first time with an upset over defending champion Novak Djokovic in four sets.

This marked the first time an Australian has beaten Djokovic at a Grand Slam since Lleyton Hewitt at the 2006 US Open.

[70] Popyrin made his Davis Cup debut for Australia in February 2019, at the age of 19, winning his first rubber against Bosnia and Herzegovina in Adelaide.