Holger Rune gained 10 kilograms after tearing his Achilles tendon in October 2025, his mother Aneke revealed in a new interview. The 23-year-old Dane has been sidelined since that devastating moment in the Stockholm Open semifinal against Ugo Humbert.

What happened to Holger Rune?

Rune was leading Ugo Humbert by a set in the Stockholm Open semifinal last October. The score was 2-2 in the second set when disaster struck. He tore the tendons in his Achilles, ending his match and his season instantly.

Doctors predicted a 9-to-12-month recovery. That timeline put his return somewhere around the US Open or the Asian swing of 2026. Rune hasn't played a competitive match since.

How much weight did Holger Rune gain?

Aneke Rune told Danish outlet BT that her son put on 10 kilos during the early phase of his rehab. "He couldn't move, so he suddenly became a giant loaf of bread because he gained a lot of muscle mass," she said.

She explained that the weight gain came from a necessary high-protein diet. "Everyone had warned us that he had to watch his weight, but he had to have enormous amounts of protein during his rehabilitation," Aneke added.

Once Rune could move again, the kilos burned off. His mother confirmed his physique is now back where it should be. "He has lost weight and gained more muscle mass in his upper body," she updated.

What is Holger Rune's return timeline?

Rune had hoped to make his comeback at the Hamburg Open, much earlier than expected. That never happened. He skipped the entire clay and grass swing of 2026.

The former Paris Masters champion recently said his injury has improved drastically. But he added that more weeks of recovery are needed before he reaches perfect condition.

There is still no confirmed date for his return. The original prediction pointed toward the US Open or the Asian swing. Fans are waiting.

Why this matters for Holger Rune's career

Before the injury, Rune's 2025 season had been uneven. He won Barcelona and made deep runs at Indian Wells and other Masters 1000 events. But early exits at majors and other big tournaments kept him from matching expectations.

At 23, he remains one of tennis' brightest young talents. But a year off at this stage of his development is a serious setback. The weight gain, while temporary, shows just how severe the injury was.

Rune documented much of his early gym work on Instagram. He has been back on court doing drills, slowly building toward full fitness. The question now is when he will step onto a match court again.