Elise Mertens’ run at the WTA 500 tournament in Singapore came to an abrupt halt as the defending champion was eliminated in the quarterfinals by Poland’s Maja Chwalinska. The top-ranked Belgian tennis player dropped a straight-sets decision, falling to her 24-year-old opponent in a match that saw Chwalinska seize control during the second set.
How Chwalinska Sealed the Quarterfinal Victory
The encounter between Mertens and Chwalinska unfolded quickly on the Singapore courts. In the second set, Chwalinska secured two crucial breaks of serve to surge ahead to a commanding 5-1 lead. Mertens managed to break her opponent’s service for the first time in the match immediately after, but the Polish player recovered quickly to close out the contest on the Belgian’s next service game.
Records show this marks the second head-to-head defeat for Mertens against Chwalinska. Their previous meeting earlier in the year at Roland-Garros saw Chwalinska claim a 6-4, 6-0 victory in the second round before eventually advancing all the way to the tournament final.
The Scheduling Decision Behind the Singapore Run
At 30 years old, Mertens arrived in Singapore as the defending champion eager to protect the ranking points she secured during her title run the previous year. To maintain her presence on the WTA circuit and defend those points, Mertens opted to skip the Billie Jean King Cup Final 8 taking place this week in Shenzhen, choosing not to join the Belgian national team squad known as the Yellow Aces.
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That decision to bypass national team duty in favor of individual WTA tour commitments sparked broader discussions within Belgian tennis circles regarding the scheduling friction between national team events and regular tour obligations. Speaking to the media about the pressures facing top players, Dominique Monami addressed the situation by pointing out that the controversy is less about a lack of commitment to the national jersey and more about whether such demanding team events can realistically fit into an already congested individual competition schedule.
Sofia Costoulas Continues in the Doubles Draw
While Mertens bowed out of the singles competition in the quarterfinals, fellow Belgian player Sofia Costoulas experienced mixed fortunes at the WTA 500 event. The 152nd-ranked player from Limburg suffered a first-round exit earlier in the week during her debut in the main draw of a WTA 500 tournament. However, Costoulas remains active in the doubles bracket.

Costoulas teamed up with Australia’s Talia Gibson to reach the tournament semifinals. The duo is scheduled to face the pairing of New Zealand’s Erin Routliffe and Indonesia’s Aldila Sutjiadi for a place in the doubles final.
Next Steps on the Tour
Following her elimination in Singapore, Mertens will look ahead to the remainder of the autumn hard-court swing, while Chwalinska advances to the next round of the tournament. Costoulas prepares for her upcoming doubles semifinal alongside Gibson.
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