Bernard Tomic defeated Aljaz Bedene 6-4 6-3 to advance to the quarter-finals of the Rosmalen Grass Court Championships on Wednesday.
Tomic, still hunting for his first ATP title of 2016, is seeded second for the tournament in the Netherlands and picked up his first tour-level win in the country.
The Australian saved a break point at 4-4 before claiming the opening set against world number 58 Bedene at the second attempt.
Tomic hit straight back after dropping his serve in game seven of the second set, winning the following two to complete the victory.
"It's a beautiful tournament," he said. "There's a lot of green, it's very relaxing and I am happy to be here. I've had my best results on grass and it is probably best suited to my game."
The world number 23 will face Nicolas Mahut in the last eight after the Frenchman came from behind to defeat compatriot Paul-Henri Mathieu 4-6 6-1 6-4.
Fourth seed Steve Johnson fell to fellow American Stefan Kozlov 6-3 6-4, the 18-year-old reaching his first ATP quarter-final and earning a first victory over an opponent ranked inside the top 40.
Sam Querrey awaits Kozlov in the next round after he beat Tatsuma Ito in straight sets 6-3 6-4.