Second-seeded Gilles Simon of France and third-seeded Sam Querrey of the United States were eliminated in the quarterfinals of the Open de Nice on Thursday.
Spaniards Alberto Montanes and Pablo Andujar and Frenchmen Gael Monfils and Edouard Roger-Vasselin reached the last four.
Wild-card entry Roger-Vasselin beat Querrey 3-6, 7-6 (2), 6-1. The Frenchman broke Querrey twice in the final set to lead 5-1 before converting his first match point with a forehand winner.
Roger-Vasselin will next play clay-court specialist Montanes. The Spaniard beat Paul-Henri Mathieu of France 6-4, 6-1.
A semifinalist at the Madrid Open earlier this month, Andujar stunned Simon 6-4, 7-5. The Spaniard hit a drop shot to break Simon at 4-4 in the opening set before rallying from a 4-1 deficit in the second.
Andujar will meet Monfils, who ousted Robin Haase of the Netherlands 6-2, 6-3.
A former top 10 player, Monfils won the last five games. The Frenchman has been bothered by a right knee injury last year, dropping to 109th in the rankings.
The Open de Nice is a warm-up tournament for the French Open which starts Sunday.