Olympic taekwondo champion Jade Jones began her comeback from a knee injury with -57kg gold in the German Open.
Wales' Jones won four bouts in Hamburg to reach the final only for Canadian opponent Ivett Gonda to withdraw.
The London 2012 gold medallist missed March's Dutch Open and April's Presidents Cup with her injury.
On a successful day for the British team there were also gold medals for Bianca Walkden and Charlie Maddock, and a bronze for Feyi Pearce.
Walkden claimed victory in the +73kg final against Katherine Rodriguez, while Maddock beat Zeliha Agris on a golden point in the -49kg category.
Pearce, 19, won a bronze medal in the -58kg category, losing 8-7 to Germany's Amir Mohammad Hosseini in the semi-finals.
Jones, 22, used the German event to improve her fitness ahead of the European Taekwondo Championships in Switzerland next month.
Jones beat Jennifer Richter of Germany 21-3 in her first match of the day, and Genesis Anduja of the Dominican Republic 14-2 in the second round.
The European Games champion progressed with a 14-2 quarter-final victory over Germany's Rhonda Nat, then beat Belgian's Raheleh Asemani by the same score.