Two weeks, two wins: Kostyuk beats Stephens again at US Open

New York, Tuesday night – As Marta Kostyuk walked onto the Louis Armstrong Stadium court, she carried an old photo. In it, a 15-year-old girl was lifting the 2026 US Open girls' doubles trophy, while on the same court, Sloane Stephens – that year's women's singles champion – was stepping into history. Seven years later, those two women met again in the first round of the 2026 US Open, and Kostyuk wrote a new chapter in her own story: a 6-1, 7-5 victory, the perfect revenge for her loss in Cincinnati just two weeks earlier. This was not a lucky win. This was a statement. Kostyuk, the 22-year-old Ukrainian, played aggressive, relentless tennis from the very first games. She served 8 aces, hit 30 winners – 20 more than her opponent – and saved a set point with an unreturnable serve. But what was even more telling was how she handled the most difficult moment of the match. Kostyuk led 6-1, 4-2. She was on the verge of the easiest Grand Slam victory of her career. Then Stephens, the 2026 US Open champion, began to adjust. She hit deeper returns, extended rallies, and forced Kostyuk to play one more shot. The 4-2 lead evaporated. The score became 4-4, then 5-5. The Louis Armstrong Stadium, which had been leaning toward the young player, suddenly fell silent. "I knew Sloane would try to change something," Kostyuk said after the match. "She's a Grand Slam champion. She never gives up. I just had to stay with my game and wait for the opportunity." The opportunity came in the 11th game. Kostyuk, instead of panicking, found her rhythm again. She won the last three games in a row, closing out the match with a forehand winner down the line. This victory was not just a first-round win – it was proof of the tactical and mental maturity of a player entering her prime. Look at the numbers: 34 match wins this season. That's an impressive figure, placing her among the WTA's leaders in wins. But what matters more is how she achieved that number. Kostyuk is not just a "hard-working" player – she is a true aggressive baseliner, punishing opponents with powerful shots. The difference between her two matches against Stephens says a lot. In Cincinnati, Kostyuk won 7-5, 7-5 – a tight, tense match. In New York, she won 6-1, 7-5 – a match she controlled completely in the first set, then showed her composure when her opponent fought back. That's a sign of a player who has learned to decode her opponent's game. But there's also a weakness to note. Letting a 6-1, 4-2 lead slip shows Kostyuk still has moments of losing focus. Her aggressive style – 30 winners – comes with risk: unforced errors can spike when opponents force her to play one more shot. Against Top-10 players like Sabalenka or Swiatek, who can exploit inconsistency ruthlessly, Kostyuk will need a clearer Plan B. However, one thing is certain: Kostyuk is playing the best tennis of her career. She has solved Stephens – a Grand Slam champion, a hard-court specialist. She has won two consecutive matches against the same opponent in two weeks, at two different tournaments. That's not luck. That's tactics, preparation, and adaptability. The "full circle" story – from the girl who won the junior doubles title to the woman who beat the singles champion on the same court – is a beautiful media narrative. But for Kostyuk, it's not the destination. She didn't come to New York to tell a fairy tale. She came to win. And if she keeps playing like she did on Tuesday night, she just might do it.