"Dulko has been improving a lot in the last year," Krajicek said. "I don't think she played her best tennis today."
Also, eighth-seeded Alona Bondarenko of Ukraine defeated Arantxa Rus of the Netherlands 6-1, 6-1.
The only seeded player to fall was No. 7 Anabel Medina Garrigues of Spain, who lost to Russian qualifier Elena Vesnina 7-6 (4), 3-6, 6-3.
Qualifier Peter Wessels of the Netherlands beat Nicolas Devilder of France and Antony Dupuis of France topped Thiemo de Bakker of the Netherlands, while Tatjana Malek of Germany beat No. 6 Katarina Srebotnik of Slovenia.
Kristof Vliegen of Belgium advanced to the second round when Fabrice Santoro of France retired at 1-1 in the second set after losing the first 6-3.
Vera Zvonareva, who has been bothered by a left wrist injury for months, withdrew from Wimbledon on Monday.
The 19th-ranked Russian also missed the French Open because of the injury. She has not played since retiring while trailing Dinara Safina in the semi-finals of the Family Circle Cup in April.
Zvonareva will be replaced by Aleksandra Wozniak. The 19-year-old Canadian lost in the first round at the Australian Open and French Open this year.
Wimbledon starts next Monday.
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