The No. 2 seed won his second match against Struff in a month, joining two-time champion Stefanos Tsitsipas in the last eight.

The 26-year-old, who reached the semifinals of the Masters 1000 event in 2023, is expected to be overtaken by Ben Shelton on April 15.

Andrey Rublev is the defending champion at the ATP Masters 1000 event.

Elena Rybakina also advanced to the quarterfinals Monday, eliminating Madison Keys in straight sets.

Home favorite Tallon Griekspoor and Alexander Shevchenko also shined Thursday in knocking out Hubert Hurkacz and Holger Rune.

Gabriel Diallo, 22, won two matches to send 2022 champions Canada to the group stage along with the Netherlands, Germany and Finland.

Joining Thursday's trend from the bottom quarter of the men's draw was Miomir Kecmanovic, who saved two match points to topple Jan-Lennard Struff.

All credit to Jan-Lennard Struff for his astonishing comeback.

One player even jumped 141 spots into the Top 10 between the 2022 and 2023 year-end rankings…

Daniil Medvedev began his Erste Bank Open title defense in style Wednesday, too.