Holger Rune is going through a very difficult period, and the Dane suffered one of the most serious defeats of his career on Friday, in the second round of the ATP Masters tournament in Shanghai.

Holger Rune beats Brandon Nakashima at ATP Shanghai

The third favorite of the race from China was outclassed by American Brandon Nakashima (122 ATP), score 6-0, 6-2. The match lasted only 66 minutes.

Holger struggled a lot on serve, winning only 49% of his first serve points and 33% of his second serve points.

Roon recently revealed that he has back problems due to a herniated disc, and his mother explained that the pain occurs every time he pitches.

Holger Roon, just one win in his last nine matches

The 20-year-old Holger has just one win in the past three months, beating Felix Auger-Aliasime (another struggling top player) in Beijing.

Wimbledon: (3) 6-7, 4-6, 4-6 vs Carlos Alcaraz

Hopman Cup: 4-6, 3-6 vs. Leandro Riedi

Hopman Cup: 2-6, 3-6 against Richard Gasquet

Toronto: 2-6, 6-4, 3-6 vs. Marcos Giron

Cincinnati: 4-6, 0-2 vs. Mackenzie MacDonald (suspension)

US Open: 3-6, 6-4, 3-6, 2-6 vs. Roberto Carballes Bayena

Davis Cup: 7-6(4), (5)6-7, 2-6 vs Thiago Monteiro

Beijing: 6-4, 6-4 against Felix Auger-Aliasime

Beijing: 3-6, 5-7 against Hryhor Dimitrov

Shanghai: 0-6, 2-6 vs. Brandon Nakashima.