In October 2025, Rune tore his left Achilles tendon during a semifinal match against Ugo Humbert, forcing him to retire in tears and undergo surgery.
The setback sidelined the Danish star for 11 months of grueling recovery before the 23-year-old returned to competition this September.
“It was scary stuff,” Rune told ATPTour.com, reflecting on his 2025 injury. “We didn't quite know what had happened in the beginning, but getting back and being able to play there already the year after is amazing.
“Usually, we play tennis and come back here the following year as if nothing happened, but a lot happened in between. I'm very happy to play here. It's really close to home, and there are so many Danish fans there as well, so I can't wait."
After returning to action earlier this autumn—including match wins at the Davis Cup and a run to the quarterfinals at the Basel Indoors—Rune is back in Stockholm on a wild card.
Today he faces Belgium's Zizou Bergs in his opening match at the tournament. It will be special mental challenge for Rune to return to the tournament which he has won before but which also marks a negative milestone in his career.
"It's going to be a different feeling,” Rune said. “Obviously, it's going to be a bit overwhelming as well, even though I've already gone through my comeback and getting back to the Tour. But I think that's part of it. It's not Stockholm's fault that I got injured. I love the tournament and have great memories of winning there in the past. I just want to come back, give a massive effort and hopefully do well."