Serena and Venus Williams said they will play for the United States in next week\'s Fed Cup Group II quarterfinal against Belarus. The best-of-five series is set for Feb. 4-5 in Worcester, Mass. The series against Belarus will mark the first time in nearly five years that the U.S. Fed Cup team featured both Serena and Venus Williams. Both sisters have seen their playing time cut short by injuries in the last 18 months. Venus Williams has most recently been sidelined by an autoimmune disease that caused her to miss the Australian Open. Serena Williams, who lost a fourth-round match at Melbourne, had an ankle injury. Serena Williams hasn\'t lost a Fed Cup match, going 4-0 in singles and 3-0 in doubles. Venus Williams is 14-2 in singles play and 3-2 as a doubles partner. In addition to the Williams sisters, the United States will have Liezel Huber and Christina McHale on hand next week. The U.S. team has been regulated to Group II in 2012, and is ineligible for the Fed Cup title.