Gael Monfils cruised into the Argentina Open quarter-finals as seeds Pablo Carreno Busta and Fabio Fognini exited on Thursday.
Monfils, unseeded at the ATP 250 event in Buenos Aires, had few problems in a second-round win over Dusan Lajovic, progressing with a 6-4 6-3 victory.
The Frenchman, who reached the last eight at the Ecuador Open, is yet to drop a set on the clay in Argentina.
Monfils will next face local Leonardo Mayer, who upset fourth seed Fognini 6-3 6-3.
Fognini, the 2014 runner-up, had won his previous three matches against Mayer - including during his run to the final four years ago - but was well beaten on Thursday.
The second-seeded Carreno Busta also made an exit, edged by fellow Spaniard Guillermo Garcia-Lopez 7-6 (7-5) 1-6 7-6 (8-6).
Garcia-Lopez twice came from a break down in the third set before battling through a thrilling tie-break.
He will face Federico Delbonis, who beat lucky loser Gastao Elias 7-6 (7-5) 7-6 (8-6).