German qualifier Jan-Lennard Struff upset fourth-seeded Casper Ruud 6-1, 7-6 (8-6) to reach the quarter-finals of the Monte Carlo Masters on Thursday.
Ranked 29th in the world, Struff dropped as low as No 168 after sustaining a foot fracture last year in Miami, an injury that left him sidelined for more than two months.
Struff has enjoyed a good start to the season and returned to the top 100 last month but had not beaten anyone in the top 10 since June 2021.
On Thursday, his aggressive style of play resulted in 37 winners and 23 points won at the net against Ruud, who dropped his serve four times and saw his nine-match winning streak on clay come to an end.
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