Modern pentathlete Samantha Murray won the first World Cup medal of her career as she took bronze in Rostov, Russia.
The 22-year-old lead into the final day's run/shoot, but she was overtaken by winner Anastasiya Prokopenko of Belarus and Ukrainian silver medallist Victoria Tereshuk.
Two places are yet to be allocated in the Team GB women's pentathlon squad.
Murray lead the field on Saturday ahead of fellow British athlete Katy Burke in second, with team-mate Heather Fell starting in seventh.
Ultimately she dropped back two places to third after being overhauled in the final 1km run.
"My running is normally better but today I didn't have it in my legs," she admitted afterwards.
Fell, a silver medallist at the Beijing Games in 2008, held off a strong challenge from Poland's Katarzyna Wojcik to finish seventh, while Burke dropped back to 11th, her best World Cup finish of the season.
Attention now turns to the World Championships in Rome at the beginning of May, which is the next chance for athletes to achieve the Olympic qualifying standard.
Britain are allowed two men and two women in their modern pentathlon squad for London 2012.
Freyja Prentice and Jamie Cooke have achieved the required standard for Team GB, but neither are guaranteed a place at the summer Games.