Here's a comprehensive summary of the Wikipedia article on Aryna Sabalenka:

Aryna Sabalenka, born May 5, 1998, is a Belarusian professional tennis player and the current world No. 1 in women's singles. Known for her aggressive and powerful style, she has won four major singles titles, securing two at the Australian Open and two at the US Open. Sabalenka also achieved considerable success in doubles, becoming a former world No. 1 and winning the 2019 US Open and 2021 Australian Open alongside partner Elise Mertens, before focusing primarily on singles.

Her breakthrough came in 2017, and she cemented her elite status by winning her first major singles title at the 2023 Australian Open, which propelled her to the world No. 1 ranking and earned her the ITF World Champion title for the season. She has since continued her dominance, successfully defending her Australian Open and US Open titles in subsequent years, clinching the year-end No. 1 ranking for two consecutive seasons.