Elena Rybakina achieved a significant milestone at the US Open by defeating Qinwen Zheng, which propelled her into the semifinals and secured her position as the new world No. 1. Rybakina's performance was impressive as she came back from a set down to win the match 3-6, 6-1, 6-4. This victory not only highlights her skill on the court but also marks a historic moment in her career as she takes over the top ranking from Aryna Sabalenka. Rybakina's ascent to No. 1 adds an exciting layer to the ongoing tournament.