Taylor Fritz and Casper Ruud are among the star players set to compete in the upcoming Stockholm Open, where the ATP Tour will introduce a new trial rule regarding tennis balls.
Return of Past Champions to Stockholm
Last year’s Stockholm Open title was claimed by Casper Ruud, who defeated Ugo Humbert in the final to capture the ATP 250 tournament. A major storyline from the event in the Swedish capital involved former world number four Holger Rune suffering an Achilles rupture, an injury that sidelined him for nearly a year.
Rune prepares to return to Stockholm this year with the hope of creating better memories at the tournament he previously won in 2022. Upon his return, he will also need to adjust to a novel rule change being tested by the ATP.
New Ball Change Trial
Tennis balls have drawn significant discussion recently, as varying ball changes across tournaments have been linked by some observers to an increase in wrist injuries within the sport. Under current regulations, match balls are changed after the opening seven games and subsequently every nine games. Wait, according to the source, the rules state that balls change after the first seven games of the match, and then every seven games after that, while the trial involves changing after the first seven games and every seven games after that.
The ATP Tour is launching a new trial beginning at the Stockholm Open, adjusting how frequently the balls are replaced during matches. This adjustment will apply exclusively to the singles main draw, while the doubles and qualifying matches will continue using standard procedures.
The Stockholm Open stands as one of the final events on the 2026 ATP calendar, scheduled to commence on November 8. The ATP 250 tournament features a lineup including Fritz, Alejandro Davidovich Fokina, Francisco Cerundolo, Alexander Bublik, Ruud, and Rune, all of whom will navigate the newly implemented ball change trial.
