PARIS — Daylight was already beginning to fade when a frowning Venus Williams walked onto the stadium court for her third-round match at the French Open.

She wasn't excited to play so late, and it showed. She lost Friday to Flavia Pennetta, 7-5, 6-3, bringing down the curtain on a dismal day for the Williams family.

When Serena took the court more than nine hours earlier, the sun was bright but the result was similar. She lost to Katarina Srebotnik 6-4, 6-4.

"It wasn't a good day for our family," Venus said.

It wasn't a good day for U.S. tennis, either. The double defeats meant that for the first time in the Open Era, there will be no American woman in the fourth round at Roland Garros.

Both losses were unsightly. Serena shanked overheads, sprayed volleys and failed to convert six break points. Venus lost serve six times and committed 29 unforced errors, many after being worn down in long rallies by Pennetta.

The Italian closed out the victory with a forehand winner at 9:47 p.m. Williams said she never asked the chair umpire to suspend the match because of darkness.

"I just kept playing," she said.

Why didn't she ask to stop?

"Because I didn't," she said.

Her sister was equally subdued after her loss. Explaining her demeanor at a postmatch news conference, Serena said, "I just don't want to be here."

Among those still hanging around were top-seeded Maria Sharapova and No. 2 Ana Ivanovic, who both won. No. 3 Jelena Jankovic was leading No. 28 Dominika Cibulkova 7-5, 4-2 when darkness forced their match to be suspended — even as Venus and Pennetta played on.

Three-time defending champion Rafael Nadal played for the fourth consecutive day in the rain-interrupted tournament and improved to 24-0 at Roland Garros by defeating Jarkko Nieminen 6-1, 6-3, 6-1. No. 3 seed Novak Djokovic beat Floridian Wayne Odesnik 7-5, 6-4, 6-2, leaving Robby Ginepri as the only American in either singles draw.

Top-ranked Roger Federer was to face the last player to beat him at Wimbledon — in 2002 — Mario Ancic.