Stefanini defeated Yastremska 6-3, 4-6, 6-1 at the US Open, pulling away with a dominant decider after the match was briefly level. The key was Stefanini's composure on second serve and her ability to save break points when Yastremska pushed.
Stefanini broke in the opening game and again at 5-3 to take the first set 6-3. Yastremska answered in the second set, breaking in game eight after Stefanini had broken in game seven, and closed it out 6-4. The final set was one-way traffic: Stefanini broke at 2-1 and 4-1 to seal the match 6-1.
Stefanini won 74 points to Yastremska's 67 and was far more reliable behind her second serve, landing 95% of those deliveries and winning 71% of the points. Yastremska hit four aces but also six double faults, while Stefanini saved five of seven break points she faced.