Alexander Stanislavovich "Sasha" Bublik (Russian: Александр Станиславович Бублик; born 17 June 1997) is a Russian-born Kazakhstani professional tennis player. He has a career-high ATP singles ranking of world No. 10 achieved on 12 January 2026, the first Kazakhstani man to reach the ATP top 10. He has won nine ATP Tour singles titles, and is the current Kazakhstani men's No. 1. He also has a career-high doubles ranking of No. 47 achieved on 8 November 2021.
Bublik recorded his greatest success at a Grand Slam event at the 2025 French Open where he reached the quarterfinals in singles, the first Kazakhstani man to achieve the feat. Bublik was also the runner-up in doubles at the 2021 French Open, partnering fellow countryman Andrey Golubev, the first Kazakhstani male players to contest a major final.
Alexander Stanislavovich Bublik was born on 17 June 1997 in Gatchina, Russia, and began playing tennis at the age of four. He was coached by his father, Stanislav.
On the ITF junior circuit, Bublik reached a combined ranking of world No. 19 and won eleven titles in total, six in singles and five in doubles.
2016: Futures titles and first ATP wins
Bublik began that season ranked No. 964. He won his first professional title, a Futures-level event in Doha, Qatar, in April 2016, followed by trophies in Russia and Sweden.
He made his ATP main-draw debut at the 2016 St. Petersburg Open, where he received wildcards into both the singles and doubles main draw.
Bublik qualified for the Kremlin Cup, where he notched the biggest win of his career, upsetting Roberto Bautista Agut in straight sets in the round of 16. He then lost a tight three-set match to the eventual champion Pablo Carreño Busta.
In November 2016, Bublik announced that he would represent Kazakhstan.
By the end of the year, Bublik's ranking had skyrocketed to No. 205.
2017: Two Challenger titles and top 100 debut
After qualifying for the Australian Open, Bublik defeated 16th-seeded Lucas Pouille in his first Grand Slam tournament match.
In February, Bublik won his first Challenger title at the Morelos Open, defeating Nicolás Jarry in the final.
At Wimbledon, Bublik received a spot in the main draw as a lucky loser. He was defeated by world No. 1 Andy Murray in his first Wimbledon appearance.
Bublik won his second Challenger title in Aptos. In September, after making the semifinals of a Challenger tournament in Istanbul, Bublik broke into the top 100 for the first time, reaching a career-high ranking of No. 95.
Bublik struggled for much of the 2018 season, seeing his ranking drop into the 200s. However, he prevailed in his last event of the year, winning eight matches to capture the Challenger title in Bratislava.
Bublik was successful early on in 2019, winning his fourth Challenger title in Budapest, followed shortly by another title at Pau.
Bublik earned his first Masters 1000 win in Miami, winning two qualifying matches and defeating Tennys Sandgren in a third-set tiebreak.