Sofia Open: Struff reaches quarter-finals, smashing Humbert

German qualifier Jan-Lennard Struff reached the last eight of the Sofia Open by winning against French qualifier Ugo Humbert 6-3, 6-1 at the Arena Armeec Sofia on Thursday.

Struff, ranked No 132, will play Italian Lorenzo Musetti, the No 4 seed, next.

The German defeated Serb Dusan Lajovic (4-6, 6-3, 6-2) in the previous round of the Sofia. Humbert, now ranked No 110, beat Bulgarian wildcard Dimitar Kuzmanov (7-6 (4), 6-4).

Sofia ATP 250, other second-round matches (Arena Armeec Sofia, EUR 597.900, most recent results first):

• Aleksandar Vukic vs. Fernando Verdasco: Thursday in Sofia
• Jannik Sinner vs. Nuno Borges: Thursday in Sofia
• Marc-Andrea Huesler vs. Pablo Carreno Busta: Thursday in Sofia
• Lorenzo Sonego vs. Holger Rune: Thursday in Sofia
• Oscar Otte vs. Kamil Majchrzak: Thursday in Sofia
• Lorenzo Musetti beat Alexandar Lazarov (WC): 6-7 (5), 7-6 (8), 6-2
• Ilya Ivashka beat Grigor Dimitrov (3): 6-3, 7-6 (3)