Italian Lorenzo Musetti, the second seed, beat Frenchman Alexandre Muller, the No 5 seed, 6-2, 6-4 to advance to the last 4 of the Athens Open.
Musetti, ranked No 9, will face American Sebastian Korda next for a place at the ATP Finals. A win would lead him to eigth rank in the world.
Ahead of his victory, the Italian edged out Swiss wildcard Stan Wawrinka (4-6, 7-6 (5), 6-4).
Athens ATP 250, other quarter-finals results (hard, EUR 766.715, most recent results first):
- Marcos Giron vs. Yannick Hanfmann
- Novak Djokovic vs. Nuno Borges
- Sebastian Korda beat Miomir Kecmanovic: 6-3, 6-2
