Boris Johnson praised US Open champion Emma Raducanu for showing “resilience under pressure” in her last game.
It comes after the 18-year-old from Kent came under heavy criticism for her withdrawal from Wimbledon this summer, in which she withdrew early from her clash with Australian tennis player Ajla Tomljanovic in the fourth round due to breathing difficulties.
Her withdrawal from competition drew disapproving comments, especially from former American tennis professional John McEnroe, who claimed Ms Raducanu had given up because she was unable to handle the opportunity.
Piers Morgan took to Twitter to say the teenager needed to “toughen up.”
In her last tweet after Sunday night’s league game, Morgan called Ms Raducanu a “Wimbledon choker” and also suggested that her victory in the United States was the result of following his advice.
During a visit to a British Gas training academy in Leicester, the Prime Minister told reporters: “I think it was magnificent and I’m sure like everyone else I watched it all with the heart in the mouth.
“I couldn’t believe how hard they were hitting that ball.
“Incredible resilience under pressure, that’s what came to me.
“There were so many times you thought the game was going to go wrong and then she held on – it’s just fantastic. So many, many congratulations.
Ms Raducanu is the first-ever qualifier to win the tournament, winning the trophy at Arthur Ashe Stadium in New York City after beating 19-year-old Leylah Fernandex without losing a set.
Her rapid rise to sporting stardom saw her rise from world number 338 to number 23. She is now Britain’s new number one.