Qualifier Mananchaya Sawangkaew produced the first major upset of Wimbledon 2026 on Monday, 29 June, overturning a match-point deficit to defeat 20th seed Maja Chwalinska 2-6, 7-5, 6-2 in a dramatic two-hour-41-minute contest at the All England Club in London. The victory is the 23-year-old Thai player's first in a Grand Slam main draw and her first career win over a Top 30 opponent.

How the match turned

Chwalinska, the Roland Garros finalist appearing in her first grass-court match of the season, appeared to be cruising toward a routine victory, leading 6-2, 5-2 and holding a match point. The contest changed in a single moment: the Polish player slipped behind the baseline while chasing a ball, allowing Sawangkaew to put away a volley winner and save the match point.

What initially seemed a minor stumble proved significant. Chwalinska required a medical timeout to treat her right leg, and her movement visibly deteriorated thereafter. Sawangkaew, who had already shown extraordinary resilience during qualifying, capitalised immediately — winning two consecutive deuce games without conceding another match point and levelling the second set at 5-5 before taking it 7-5.

Sawangkaew's dominant finish

Chwalinska broke early in the deciding set to lead 2-0, but her injury continued to restrict her ability to push off on serve and return. Sawangkaew then seized control entirely, winning the final six games in a row to close out one of the most remarkable victories of her career.

Ranked No. 164 in the world, Sawangkaew had already demonstrated her fighting qualities in qualifying, saving three match points to defeat Oceane Dodin 5-7, 7-5, 6-1 and earn her place in the main draw. Notably, this is her first full Grand Slam campaign following a six-month injury layoff after suffering a back injury at Roland Garros last year; she made her Grand Slam main-draw debut at the 2026 Australian Open.

Historic moment for Thai tennis

The win ended an eight-year drought for Thai women's tennis at Wimbledon. Sawangkaew became the first player from Thailand to win a women's singles match at the All England Club since Luksika Kumkhum reached the second round in 2018.

She is one of two Thai women in this year's main draw, matching the country's Open Era record. Should compatriot Lanlana Tararudee defeat Lilli Tagger in her opening match, it would mark the first time two Thai women have simultaneously reached the second round of the same Grand Slam.

Chwalinska's grass transition cut short

Before the injury, Chwalinska had shown genuine promise in adapting her clay-court game to the surface — mixing sharp slices, drop shots, and confident net play to build her commanding lead. She saved three break points while holding for 5-2 in the second set, suggesting the grass transition was well underway. The injury, however, ended any prospect of completing what had looked like a comfortable victory.

Sawangkaew will now face the prospect of a second-round match at a Grand Slam for the first time, with the wider women's draw watching a qualifier who has now beaten a seeded opponent twice in the same fortnight.