Jessica Pegula responded to an opening-day setback with a composed and clinical performance, defeating Marta Kostyuk 6-2, 7-5 in the Group 1 round-robin stage of the 2026 WTA Finals at Indian Wells on Tuesday. With her semifinal ambitions hanging in the balance, the fifth seed delivered when it mattered, capitalising on Kostyuk’s serving struggles to register her first victory of the tournament and remain in contention for a place in the knockout rounds.
The American needed just one hour and 29 minutes to overcome the Ukrainian, who entered the season-ending championship as a late replacement following Elena Rybakina’s withdrawal. While Pegula dominated proceedings in the opening set, Kostyuk showed greater resistance in the second before a costly serving error at a crucial moment allowed the American to close out the contest. Pegula wasted little time establishing control, winning the opening nine points of the match and immediately breaking Kostyuk’s serve without dropping a point.
Her aggressive baseline play and ability to dictate rallies left the Ukrainian struggling to find her rhythm. Pegula’s consistency was particularly evident in the opening set, where she committed just three unforced errors compared to Kostyuk’s 17. The American wrapped up the first set 6-2 in approximately 30 minutes, putting herself in a commanding position. Kostyuk attempted to turn the momentum around in the second set, showing greater intent with her groundstrokes and finding opportunities to challenge Pegula’s serve. However, her inability to maintain consistency on serve continued to hurt her chances.
The Ukrainian recorded nine double faults throughout the match, while Pegula won 76 per cent of her first-serve points. The American also won 73 of the 130 total points contested, underlining her control over the majority of the encounter. The second set proved considerably more competitive as Kostyuk began finding openings and managed to put Pegula under pressure. Despite the American maintaining her advantage, the Ukrainian fought hard to stay in the contest and extended the rallies. She also managed to create break opportunities, converting two of her three chances during the match.
However, just when Kostyuk appeared to be building momentum, a double fault at 5-6 handed Pegula the opportunity to serve for the match. The American made no mistake, holding her nerve to close out the second set 7-5 and secure a straight-sets victory. Reflecting on her performance, Pegula highlighted the importance of maintaining her advantage after making such a strong start. “Once I got off to a good start today, I definitely didn’t want to give away that second set,” the No. 5 seed said afterwards. “It was a bit of an extra push to be able to give myself the best chance in this group, considering I did lose the first match.”
The victory was particularly important for Pegula following her opening-round defeat to compatriot Coco Gauff. The American had lost a three-set encounter against Gauff, 6-4, 6-7, 6-2, and needed a response to keep her campaign alive. For Kostyuk, however, the defeat marked the end of her semifinal ambitions. Two consecutive straight-set losses in her WTA Finals debut left the Ukrainian unable to progress to the knockout stage.
Interestingly, Kostyuk had entered the tournament with victories over Pegula in both of their previous meetings in 2026, including at Brisbane and Madrid. The American finally reversed that trend with a disciplined performance in Indian Wells. Kostyuk’s serving difficulties were also a continuation of her opening-match struggles against Linda Noskova. Having recorded six double faults against the Czech, she accumulated another nine against Pegula, bringing her total to 15 across her first two matches.
Pegula will now turn her attention towards Linda Noskova in the final round of Group 1, setting up a rematch of their 2026 Berlin Open final encounter on Thursday. Pegula’s victory highlighted the importance of experience and composure in the demanding round-robin format of the WTA Finals. After suffering a difficult opening defeat against Gauff, the American understood that another setback could put her campaign beyond reach. Against Kostyuk, she showed better patience, controlled the baseline exchanges and made the most of her opponent’s serving inconsistencies.
For Kostyuk, the tournament has exposed an area that will require attention, particularly her second serve and ability to manage pressure during crucial moments. With Linda Noskova already securing her semifinal qualification, the remaining Group 1 spot remains the central battle heading into the final round of matches. Pegula now has an opportunity to use her experience and momentum to extend her season-ending campaign.
The 2026 WTA Finals, being held at Indian Wells Tennis Garden from November 8 to 15, brings together the eight leading singles players of the season. With the group stage approaching its conclusion, every remaining match carries significant weight in determining the semifinal line-up.
