Born in Minsk, Aryna Sabalenka started playing aged 6. She made debut on ITF Circuit in 2012 at $25k event in Minsk.
She continued to play on ITF circuit in 2013 ans 2014, and in 2015 she won three singles titles and one doubles title on that circuit.
In 2016 she rose nearly 400 places in the rankings, ending year at No.155. She won two $50k ITF event in Tianjin and Toyota and made her WTA qualifying debut in Rabat.
Sabalenka posted her first Top 100 season finish in 2017, ending year at No.78. Her season highlight was reaching the first tour-level final at Tianjin (l. Sharapova). She also made a semifinal run at International-level Tashkent (l. Babos). 2017 marked and her Grand Slam main draw debut at Wimbledon, falling in the second-round (as qualifier, l. Witthoeft), and WTA main draw debut in Dubai (as qualifier, l. Ka.Bondarenko).
She was also member of the Belarus Fed Cup Team that advanced to competition final in 2017, going 1-1 in singles and 0-1 in doubles as her side lost to USA. During that final in Minsk, she scored her first Top 20 win of career with defeat of No.13 Stephens. She rounded out the season by lifting WTA 125k Series title in Mumbai (d. Jakupovic).
In 2018, by far her breakthrough season, she collected 46 main draw wins: Prior to 2018, she had owned just 12 main draw victories. Sabalenka opened the season with back to back quarterfinals in Shenzhen and Hobart. On hardcourt, she produced a third-round run on Premier Mandatory debut at Indian Wells (d. 2017 runner-up Kuznetsova, l. Vondrousova), prior to advancing to the second round in Miami the following week (l. Kvitova). On clay, she reached her second career WTA final at Lugano (l. Mertens), but she fell at the first round in Madrid, Rome and at Roland Garros.
She started the grass court swing with a quarterfinal appearance at ‘s-Hertogenbosch (l. eventual runner-up Flipkens). She reached her first Premier-level final at Eastbourne (l. Wozniacki), recording wins over No.13 Goerges, No.15 Mertens and No.7 Pliskova en route to final.
In North America, she posted her best Grand Slam result at US Open, advancing to the round 16 (l. eventual champion Osaka). She had previously lifted her maiden WTA title in New Haven (d. Suárez Navarro). She had also posted a round 16 finish in Canada, after saving two match points to upset No.2 Wozniacki, and a semifinal run in Cincinnati (l. eventual R-Up Halep); during that run, she saved match points to upset No.9 Karolina Pliskova and No.5 Garcia in the round 16.
During the Asian Swing, she won her biggest title of career in Wuhan (d. Kontaveit) and reached the quarterfinals in Beijing. During that run, she beat No.8 Garcia in the round 16 to seal the eighth Top 10 win of the season and of her career. After that run, she posted her career-high ranking of No.11 after Beijing run (October 8, 2018). She made her debut in Zhuhai but failed to reach the semifinals.