After signing 17-year-old João Fonseca, On apparel adds Julia Stusek, 15, to roster

The Roger Federer-backed Swiss brand On is slowly adding more young talents to its budding tennis portfolio.

After signing 17-year-old João Fonseca last year to join Ben Shelton as an ATP client, 15-year-old German Julia Stusek has signed joined Iga Swiatek as the brand's WTA representatives.

Stusek made her WTA main-draw debut this week in Bad Homburg as a lucky loser, falling competitively 6-2, 7-5 to a Top 50 player in American Peyton Stearns, in which fans were quick to noticed that the young German was wearing the On tank and skirt that Swiatek donned while winning her Roland Garros title earlier this month.

If Swiatek and Shelton are the present for On's fledgling tennis presence, with both signing contracts with the brand in 2022, then Fonseca and Stusek can be considered its bet for the future. The 2023 junior US Open champion, Fonseca turned professional earlier this year, after reaching the quarterfinals in Rio de Janiero as a wild card. He is the first ATP player born in 2006 to win a main-draw match at tour level, and also won a round at the ATP Masters 1000 in Madrid in April.

Stusek is considered one of Germany's brightest young talents in a country that's been known in recent years to produce late bloomers, particularly on the WTA side. In 2022, at age 13, she won the prestigious Les Petit As title, and this year, was a finalist at the junior Australian Open in doubles.

“Couldn’t be more thrilled to become a part of the On team," Stusek wrote on Instagram last month when she signed. "Extremely excited to represent this unique, young and creative brand on and off the tennis court.”

After the brand signed *Challengers *star Zendaya as a brand ambassador earlier this month, might we be seeing these talented teens posing with Tashi Duncan in front of the camera sooner rather than later?