Great Britain's Bianca Walkden and Mahama Cho had to settle for bronze medals in the World Taekwondo Grand Prix in Suzhou, China.
European champion Walkden retired during the second round of her +67kg last-four bout with China's Shuyin Zheng because of a leg injury.
Cho, a World Grand Prix winner in Manchester, was beaten 9-8 by Korean Cha Dong-Min in their +80kg semi-final.
Seven British fighters are taking part in the event from Friday to Sunday.
|Team GB's World Taekwondo Grand Prix fighters:|
|Friday, 4 July: Mahama Cho (+80kg); Bianca Walkden (+67kg) - both win bronze medals|
|Saturday, 5 July: Aaron Cook (Isle of Man), Lutalo Muhammad, Damon Sansum (-80kg)|
|Sunday, 6 July: Michael Harvey, Ruebyn Richards (-68kg); Jade Jones (-57kg)|
On Saturday, London 2012 bronze medallist Lutalo Muhammad will contest the -80kg along with Damon Sansum.
The British pair could meet world number one Aaron Cook, the former British fighter who now represents the Isle of Man.
Cook, 23, quit the GB set-up in 2011 and was controversially overlooked for the London Olympics in place of eventual bronze medallist Muhammad.
Olympic champion Jade Jones will fight on Sunday at -57kg, while Michael Harvey and Ruebyn Richards will also be in action at -68kg.
The Grand Prix series events are part of the qualification campaign for the 2016 Olympics in Rio de Janeiro.
Those ranked in the top six of each Olympic division after the final Grand Prix event in 2015 will be guaranteed places in Brazil.