Russian-born Varvara Gracheva has won the first match she played since becoming a French citizen.
Gracheva, 22, was born in Moscow but has lived and trained in France for six years.
She beat Romanian Jacqueline Cristian 6-2 6-2 at the Bad Homburg Open in Germany on Monday.
World number 43 Gracheva becomes the French women's number two and will represent her new country when Wimbledon starts on 3 July.
She played at the French Open in May but was not listed as French as she had not yet received her French passport.
Russian and Belarusian players will be allowed to compete at this year's Wimbledon, but players must abide by strict rules set out by the All England Club.