Veteran Marcos Baghdatis of Cyprus has beaten French top seed Lucas Pouille 7-6 (2) 6-7 (3) 6-4 to reach the Open Sud de France quarterfinals.
Baghdatis, a 2006 Australian Open finalist, served for the match at 5-3 in the second set.
However Pouille, who lost in the semifinals to eventual champion Novak Djokovic at this year's Australian Open, fought back to take it into a third.
Baghdatis, 33, next faces Romanian Radu Albot, who laboured into the last eight by beating Ernests Gulbis of Latvia 7-6 (5) 4-6 6-4.
Third-seed Canadian Denis Shapovalov earlier used his strong serve to beat Marcel Granollers 6-4 7-6 (1).
The 19-year-old wild-card did not face break point and won 30 of 33 first-serve points against the Spanish veteran.
Shapovalov was one of only two players to take a set from Djokovic at last month's Australian Open but is yet to win a career title on the ATP Tour.
He next faces seventh-seeded Frenchman Pierre-Hugues Herbert, who rallied to a 4-6 6-4 6-2 win over Ilya Ivashka of Belarus.