Professionals in tennis play only a few weeks on grass courts, but they invariably present drama, upsets, and breakthroughs. Acts of veteran resurgence, shocking upsets, and new talents upsetting the old order were the exciting elements mixed in 2025 in the ATP and WTA tours. At Queen’s Club and Wimbledon, results not only surprised overnight stars but knocked some of the more consistent players to their knees as they slipped on the slick green courts. It was a 37-year-old mother who was beating the odds, or the upcoming young talent who had been setting records as they cruised into the unknown territory, but this year at the grass swing reminded the fans why this surface has always been the most unpredictable in tennis.
These are five of the greatest surprises that stunned people and changed expectations of the 2025 grass season.
1. Tatjana Maria
Tatjana Maria, 37 years old and a mother of two, shocked the tennis world when, in June of 2025, Queen’s Club hosted the first women’s event in tennis since 1973, and Maria emerged the winner. As a qualifier, she was seeded 86th and defeated four Top-15 players along the way, including Amanda Anisimova in the final, losing only once in nine matches. This improbable victory ended a 9-match losing streak before the tournament, and it made her the oldest female winner in WTA since Serena Williams in 2020. For bettors savvy enough to find top tennis match odds on long shots, Maria’s run was a reminder that experience and grit can still pay big, especially on overlooked stages.
2. Gabriel Diallo
Gabriel Diallo, who is pursuing his maiden ATP title run because he is currently playing at the Libema Open, triumphed over the seeded opponents, such as Karen Khachanov and Ugo Humbert, to reach the final against the first in the ATP rankings, or in other words, his initial grass final run. This victory led him to the Top 50, rising to world No. 44 by mid-June. The quick rise of Diallo thus made him a real direct threat on the grass in spite of the few matches played before on this surface.
3. August Holmgren
A Danish qualifier, August Holmgren, at the time ranked around No. 192, became a headline–beating Tomas Machac in four hours and 39 minutes in the second round, saving several match points. His debut Grand Slam reached the third round, where he became only the second Danish man in the Open Era to reach such a stage and got his nickname at that time.
4. João Fonseca
As the first Brazilian man in Wimbledon since 2010, João Fonseca became the youngest since Bernard Tomic in 2011 to hit the third round. His first effort was the explosive form playing as a qualifier, turning to the main-draw contender in the breakout year that comprised an ATP title along with the Top-100 status.
5. Wang Xinyu
Although it was not a grass event at the WTA per se, the Berlin 500 was another pre-event. Wang Xinyu tops the list as the 23-year-old qualifier, who upset four of the top 20, including Coco Gauff and Liudmila Samsonova, to make it to the final. Wang has made her presence felt entering the grass swing after losing in the marathon match defending Wimbledon champion Marketa Vondroushova.
These are five surprise stories suggesting how a brief but intense grass season can turn expectations upside down. All the qualifiers and the veterans, 2025 turned the cards completely, and there is truth in the saying that anything is possible in the low-bounce, fast-playing grass courts in tennis.
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