Answer
Teichmann clinched the US Open girls' doubles title alongside Belinda Bencic in 2014, defeating Anhelina Kalinina and Iryna Shymanovich in the final. Bencic and Teichmann's triumph marked the first time a Swiss duo had won a junior Grand Slam doubles title since Martina Hingis and Patty Schnyder achieved the feat at the 1994 Australian Open.