No. 6 seed Jack Draper of Great Britain racked up 31 aces and rallied to beat No. 4 seed Frances Tiafoe 5-7, 6-4, 7-6 (1) Friday to reach the semifinals of the Boss Open in Stuttgart, Germany.

Draper committed only three double faults while hitting his dominant serves past Tiafoe, who was the defending champion. The aces helped Draper win 53 of 62 first-service points (85.5 percent), including 18 of 19 in the second set alone.

Draper moves on to face another American, Brandon Nakashima, who advanced via walkover after seventh seed Jan-Lennard Struff of Germany withdrew.

The other semifinal will pit Italians Lorenzo Musetti, the fifth seed, and Matteo Berrettini against one another. Berrettini defeated Australian James Duckworth 6-4, 7-5. Musetti led 4-6, 6-1, 1-0 when third seed Alexander Bublik of Kazakhstan retired.

Libema Open

No. 7 seed Sebastian Korda swept past No. 2 seed Tommy Paul 6-4, 6-2, in an all-American quarterfinal in ‘s-Hertogenbosch, Netherlands.

Korda won an overwhelming 27 of 32 first-service points (84.4 percent) and broke Paul’s serve four times in eight chances in the 67-minute romp. His next opponent will be defending champion and sixth seed Tallon Griekspoor of the Netherlands, who was a 4-6, 6-3, 7-6 (4) winner over Australia’s Aleksandar Vukic.

The only other match of the day saw No. 1 seed Alex de Minaur of Australia beat Canadian Milos Raonic 7-5, 6-2. He awaits the winner of the quarterfinal to be concluded Saturday between No. 3 Ugo Humbert of France and Dutch qualifier Gijs Brouwer.

–Field Level Media