S-HERTOGENBOSCH, Netherlands (AP) CoCo Vandeweghe started the defense of her Topshelf Open title with a 7-6 (1), 6-1 win over Andreea Mitu on Monday as the season shifted to grass.
The third-seeded Vandeweghe, who won her sole career title in the Netherlands last year, trailed 4-1 in the first set before she found her range. She saved four of the five break points she faced and fired nine aces.
Mitu, who made it to the fourth round at the French Open, was overwhelmed in the tiebreak and dropped her serve twice in the second set.
Fifth-seeded Camila Giorgi also progressed to the second round with a 7-5, 6-2 win over Irina Falconi.
In men's play, Robin Haase defeated Blaz Kavcic 6-2, 7-5 and Gilles Muller beat Marsel Ilhan 6-0, 7-5.