Serena’s Slam bid delayed a day

NEW YORK — Serena Williams will have to wait before continuing her bid for a calendar-year Grand Slam: Her U.S. Open semifinal was postponed because of rain in the forecast.

The top-seeded Williams was supposed to face 43rd-ranked Roberta Vinci of Italy on Thursday night at Flushing Meadows, but nearly four hours before that match would have started, the U.S. Tennis Association — citing a prediction of “rain throughout the evening” — pushed back both women’s semifinals until today.

When the USTA announced the rescheduling, there were doubles and juniors matches in progress. But the rain did eventually arrive, wiping out play, a little more than an hour before Williams and Vinci were supposed to take the court.

Williams is trying to become the first tennis player since Steffi Graf in 1988 to earn all four Grand Slam titles in a single season. She won the Australian Open in January, the French Open in June and Wimbledon in July. Now the 33-year-old American has won her first five matches at the U.S. Open, and needs two more victories to add that championship to her 2015 collection.

The other women’s semifinal moved to today from Thursday is No. 2 Simona Halep of Romania against No. 26 Flavia Pennetta of Italy.

It created a high-profile and packed schedule for today, when the men’s semifinals already were slotted.