Umag - Defending champion Tommy Robredo beat fellow Spaniard Albert Ramos-Vinolas 6-4, 6-4 on Wednesday to reach the quarter-finals of the Croatia Open.
Robredo, seeded second, converted only two out of 11 break points on his way to victory. The Spaniard played a very solid game from the baseline and won 90 percent of his first serves.
Third-seeded Marin Cilic of Croatia also advanced, beating Dutchman Igor Sijsling 7-5, 6-3. It was Cilic's fourth victory over Sijsling in as many encounters and the Croatian was dominant from the start.
He took a 5-2 lead in the first set before Sijsling leveled for 5-5. Cilic then broke in the 12th game on his second set point.
Cilic, who won the tournament in 2012 and reached the 2011 final, broke again at 3-2 in the second set before easily finishing off the match.
"It is good that I won in two sets, conditions here are tough with humidity and heat," Cilic said. "I have adjusted well to the conditions, but winning as fast as possible is always recommended."
Fifth-seeded Czech Lukas Rosol also reached the quarter-finals, defeating Spaniard Pere Riba 7-6 (4), 6-1.
Spain's Pablo Carreno Busta advanced by walkover after eighth-seeded Carlos Berlocq of Argentina withdrew because of an injury.