Thursday.

Henin, basking in the glow of her fourth French Open title in the past five editions, remains an undefeated 6-0 at Devonshire Park after winning the Wimbledon tune-up event at her 2006 debut.

Czech Vaidisova, seeded fifth with a world number 14 ranking, never found her comfort zone on a surface where she reached the Wimbledon fourth round a year ago.

Henin, the world number one, is polishing her game after another triumph on clay in Paris, and has had few problems so far in making the switch over to grass.

The 25-year-old Belgian will Friday face the winner from the match between Russian fourth seed Elena Dementieva and France's Marion Bartoli.

Henin was ruthless in grinding out her victory in less than an hour, her third without the loss of a set against Vaidisova. She started with a 5-0 lead in the opening set as Vaidisova struggled from the start.

The Belgian dominated with four breaks of the Czech's serve. Vaidisova donated a fifth double-fault to hand over a match point, which Henin took with a winner to advance.

Second seeded Wimledon holder Amelie Mauresmo was playing her quarterfinal alter against Israeli sixth seed Shahar Peer.