Paolini-Kostyuk at Wimbledon: the quarterfinal will be decided on the second serve

Jasmine Paolini and Marta Kostyuk play today for a place in the semifinals at the Championships, seeds number 13 and 12, in the first meeting of their careers on grass. In their other three previous encounters neither of them has ever played on this surface, and it is precisely the surface that shifts the center of gravity of the analysis: the factor that tilts the quarterfinal is not Kostyuk's power, which is there and matters, but her reliability on serve. On a court that offers little forgiveness to a short second ball, the Ukrainian arrives with the most fragile statistic of her 2026.

The fault line: Kostyuk's second serve

Kostyuk is in a run of form that reads twenty wins in her last twenty-one matches, with the most solid clay spring of her career: titles in Rouen and Madrid and a first Slam semifinal in Paris. But her serve remains a high-risk shot. This season she is running at an average close to four double faults per match, and in the fourth round against Krueger she won only 67% of points on her first serve, the lowest figure of her tournament.

The number matters because Paolini is one of the most effective returners on the tour at putting the ball back deep and taking away time. Against a first serve at 190-200 km/h she can struggle, but on Kostyuk's second serve she enters the rally from a commanding position. The tactical question of the match is simple: how many second serves will Kostyuk have to play, and with how much conviction. In her last two matches she has cut her double faults to three in total. If she holds that level, her ball weight remains a problem for anyone. If she reverts to the eleven double faults of a single service game in the second round, she hands Paolini breaks that are hard to recover on grass.

The grass factor: movement and pedigree

Here the experience gap is clear. Paolini was a Wimbledon finalist in 2024 and has never lost a Slam quarterfinal in her career. She knows how to move on grass, to change direction with a low base, to defend and counterattack, and she reads the short rally better than almost anyone. Kostyuk, by contrast, came into 2026 with a career record on grass of 10-25, her least productive surface. The London quarterfinal is her first at a tournament on this surface.

It does not mean grass penalizes her today: her flat, early-struck tennis is in theory well suited to low bounces, and this week's wins confirm it. It means that, in the moments when the match tightens, Paolini has an archive of solutions that her opponent is building right now, live. Quarterfinals are won on the points that are not in the script, and there the Italian starts ahead.

The wild card and the condition that overturns it

The unknown on Paolini's side is physical. A foot problem has followed her all season and allowed her only one warm-up match on grass before Wimbledon. In the first round she lost the opening set 6-0 against Montgomery before turning it around, a sign of slow fine-tuning. If the foot forces her to shorten the rallies and take risks earlier than she should, the attritional plan on return loses its effectiveness, and that is exactly the scenario in which Kostyuk's power dictates terms.

The prediction

On this surface and with these numbers, Paolini starts a slight favorite. Her edge is not in shot-making but in reliability: she serves fewer double faults, she moves better, and she has already been through this stage of the tournament without cracking. The prediction is Paolini in two or three sets, with the match hinging on the number of second serves Kostyuk will be forced to play. The condition that overturns the forecast is twofold: if Kostyuk keeps her double faults at the lows of her last two matches and her first serve above 65% of points won, her ball weight can close out the rally before Paolini builds it; and if the Italian's foot betrays her, the movement advantage on which everything else rests vanishes.