Jan-Lennard Struff upsets Stefanos Tsitsipas to reach Madrid semis

Lucky loser Jan-Lennard Struff is stunningly in the Matua Madrid Open semifinals after posting a 7-6 (5), 5-7, 6-3 victory over fourth-seeded Stefanos Tsitsipas on Thursday.

Struff smacked 14 aces in the quarterfinal upset to earn a semifinal date against Aslan Karatsev, who beat Struff in qualifying last week.

They will play again Friday with a finals berth on the line. Karatsev advanced with a 7-6 (3), 6-4 victory ove