The open water swimming events at the 2025 World Swimming Championships in Singapore faced multiple postponements due to concerns over water quality and temperature. The 10-kilometer open water race was delayed twice because of polluted and dangerously warm water around Sentosa Island. Despite these challenges, the competition eventually commenced. Florian Wellbrock secured his seventh world championship title in a difficult race, overcoming rough sea conditions and previous Olympic trauma. Italian swimmers Gregorio Paltrinieri and Ginevra Taddeucci both earned silver medals in the 10 km open water event, with Paltrinieri, nearly 31 years old, signaling his intent for the upcoming Olympics. Brazilian swimmer Ana Marcela Cunha finished off the podium and criticized the water quality and heat. The event highlighted ongoing environmental issues affecting open water competitions at the championships.