First quarter-final, first Top 50 victory: the 17-year-old German is causing a minor sensation on home grass at the BOSS Open.

Top-seeded home favorite Alexander Zverev moved into the BOSS Open quarterfinals with a 6-2, 7-6 (7) win over Frenchman Corentin Moutet on Thursday in Stuttgart, Germany.

German 17-year-old Justin Engel reached a quarter-final of an ATP Tour event for the first time in his young career. He achieved that on Thursday at the Stuttgart Open with a 6-4, 6-4 win against seventh seed Alex Michelsen in the last 16.

STUTTGART, GERMANY (AP) _ Results Sunday from Boss Open at Tennis Club Weissenhof (seedings in parentheses): Santiago Gonzalez, Mexico, and Austin Krajicek, United States, def. Rajeev Ram and Alex Michelsen, United States, 6-4, 6-4.