The tournament line up for the Heineken Tennis Open next month has been confirmed with four world top 20 players in the draw.
The top-20 players include current world No 9, Argentine Juan Martin Del Potro, No12 Spain's David Ferrer who has been as high as number four.
Swede Robin Soderling is ranked at 17 while the fourth seed will be world No18 is Spain's Nicolas Almagro.
The defending champion, Philipp Kohlschreiber of Germany and this year's runner up former world number one Juan Carlos Ferrero are also returning.
The field features three players who recently played in the Davis Cup final between Spain and Argentina they are Del Potro, Ferrer and Jose Acasuso ranked at No48.
