'S-HERTOGENBOSCH, Netherlands - The semifinal line-up took shape at the $220,000 Unicef Open on Thursday, minus No.3 seed Yanina Wickmayer, who was surprised by a player better known for her exploits on clay: seventh-seeded Roberta Vinci.

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Having applied her one-handed slice to great effect to get a set and a break ahead, Vinci issued her seventh ace of the match to set up three match points against her young Belgian opponent. Wickmayer held off two of them but the Italian went through on the third, 64 64.

Three of 28-year-old Vinci's four titles have been won on red clay - the most recent coming at Barcelona this year - and should she win her next match she'll be through to the first grass court final of her career.

Meantime, another Italian, qualifier Romina Oprandi, continued to make the most of her Clijsters-beating run. After grabbing the first set in a tie-break, the Switzerland-based world No.82 beat Japanese veteran Kimiko Date-Krumm in straight sets, 76(3) 64.

Oprandi's semifinal opponent will be Jelena Dokic, after the former world No.4 edged Johanna Larsson in two tight sets, 76(2) 64. The fourth quarterfinal saw No.2 seed Svetlana Kuznetsova take on No.5 seed Dominika Cibulkova, but the match was interrupted by rain for the final time with the score at 75 46 30 in Cibulkova's favor. Vinci awaits the winner.

In the doubles, the fourth-seeded Barbora Zahlavova Strycova and Klara Zakopalova proved too strong for wildcards Kirsten Flipkens and Coco Vandeweghe, 64 61. The Czechs meet unseeded Cibulkova and Flavia Pennetta in the final.