Hosa, the Chinese swimwear brand, has renewed its sponsorship deal with FINA, aquatics' world governing body, for four more years.
The new agreement, which runs to 2021, again covers official sponsorship of the Diving World Series and title sponsorship of the renamed Marathon Swim World Series, formerly the 10km Marathon Swimming World Cup.
Hosa first teamed up with FINA for both competitions ahead of the 2015 season.
Hosa chairman Shi Hongliu said: "We will continue our international strategy with FINA and provide more efforts on promoting aquatic sports in the world. We will try hard to train more young talents, venue building, competition management. We will make it our priority to make aquatic sports stronger and more popular."
Last week, FINA announced China National Sport Group, a state-owned organisation, as title sponsor of the Diving World Series to 2021.
The company replaced NVC Lighting, the Chinese lighting manufacturer, ahead of the series opener in Beijing.