Aljaz Bedene has won his first match since becoming a British citizen and taking up the British No.2 position behind Andy Murray.
Slovenian-born Bedene, 25, has lived in the UK for seven years and earned the right to citizenship earlier this week.
He won in the opening round of qualifying for the Casablanca Open, beating Frenchman Maxime Chazal 6-3 6-2 on the clay in Morocco.
Ranked 83rd in the world, Bedene is 28 places ahead of James Ward at 111, who is now British No.3.
On seeing "GBR" next to his name in the Casablanca Open schedule, he wrote on Twitter: "It's taken a while to get to this, but it's awesome to see. I love being able to use #BackTheBrits too!"
On the victory, he added: "Happy to get the first match out of the way. Was solid to be fair and more to come which is always good. Looking forward to the next one. Thanks for all the support and love guys, I feel really lucky."
Bedene reached his first ATP Tour final at the Chennai Open in India earlier this year, where he lost to Stan Wawrinka. But he beat three seeds en route to a return to the world's top 100.
Bedene, who received the backing of Murray earlier in the week, will now face either Michael Linzer of Austria or France's Maxime Texeira in the next round in Casablanca.
One down π¬π§π¬π§π¬π§
— Aljaz Bedene (@AljazBedene) April 4, 2015