Juan Martin del Potro sets up Grigor Dimitrov semi-final

Juan Martin del Potro has said that there are "no easy matches" at the Rotterdam Open following his 6-3 6-4 victory over Jarko Nieminen.

The Argentine will now face Bulgaria's Grigor Dimitrov later today for a place in Sunday's final.

Del Potro - a beaten finalist last year - said that Nieminen was a tough opponent, despite the convincing scoreline.

"There are no easy matches here," Del Potro told reporters.

"Nieminen played some excellent forehands on important points and I had to stick to my game plan and be patient."

French duo Gilles Simon and Julien Benneteau will contest the other semi-final.