France's Ugo Humbert stunned top-seeded Daniil Medvedev 6-4, 6-3 Tuesday in the first round of the Hamburg European Open in Germany.
Medvedev, ranked No. 5 in the world, was coming off a run to the U.S. Open semifinals. Humbert converted three of five break points to record the first Top 10 victory in his career.
"I know I can play very nice on clay," the 22-year-old Humbert said. "Daniil is a very nice player. I am very happy with my first Top 10 win and for sure, it was one of my biggest wins today."
No. 6 seed Fabio Fognini of Italy and No. 8 Karen Khachanov of Russia each came from behind to win Tuesday. Fognini outlasted Germany's Philipp Kohlschreiber, 4-6, 6-1, 7-5. Khachanov trailed 0-3 to Germany's Jan-Lennard Struff in the third set before rallying for a 7-6 (5), 4-6, 7-5 victory.
In other action involving seeded players, Germany's Yannick Hanfmann knocked out No. 3 Gael Monfils of France, 6-4, 6-3, and No. 4 Roberto Bautista-Agut of Spain defeated Georgia's Nikoloz Basilashvili by the same score. Also advancing were Canada's Felix Auger-Aliassime, Kazakhstan's Alexander Bublik and Serbia's Dusan Lajovic.
--Field Level Media