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.
