Top-seeded Bernard Tomic has crashed out out of the Istanbul Open, losing to unseeded Diego Schwartzman of Argentina 6-2 6-2.
It was the second time in as many weeks that the Queenslander has been knocked out of a clay court tournament at the first hurdle following his early exit in Bucharest
"I'm playing well on these courts, which are slow," Schwartzman said.
"I tried to be focused today and I think I played a great match."
In the quarter-finals, he faces Damir Dzumhur of Bosnia and Herzegovina, who defeated Illya Marchenko of Ukriane 6-3 5-7 6-3.
Third-seeded Ivo Karlovic hit 13 aces to advance past Dusan Lajovic of Serbia 7-6 (11-9), 7-6 (7-5), recording his 300th career victory, and will play fifth-seeded Marcel Granollers of Spain, who defeated Hyeon Chung of South Korea 6-3 6-4.
