Richel Hogenkamp, who had played only doubles matches for the Dutch team until last year, upset a higher-ranked opponent for the second day in succession to give her team a winning start.
The world No. 205 beat An-Sophie Metsach, the world No. 123, 75 63. After a tight first set Hogenkamp got an early break in the second and went on to complete her victory in style with a huge forehand winner into the corner.
Kiki Bertens beat Yanina Wickmayer 62 75, but only after a bruising second set. Wickmayer, whose game had gone awry in the latter stages of the first set, started hitting the ball with consistent power and went 5-3 up in the second, but Bertens clung on.
Having broken back to 4-5, Bertens won a marathon tenth game, saving set points in the process, and broke again to lead 6-5. When she served for the match the Dutch No. 1 was calmness personified.