The nine-team US circuit will stage its 45th campaign at The Greenbrier in White Sulphur Springs, West Virginia, from July 12-August 2.
Ashleigh Barty beat Laura Siegemund 6-3, 6-2 in the Qatar Open while Sofia Kenin lost to Dayana Yastremska.
Ashleigh Barty stayed on top of the Women's Tennis Association rankings despite losing in the semi-finals of the Australian Open.
Sofia Kenin and Bethanie Mattek-Sands defeated Jelena Ostapenko and Anastasija Sevastova 6-4, 6-0 in a deciding doubles as the USA defeated Latvia 3-2 to reach the Fed Cup finals.
Garbine Muguruza gave up a one-set lead and lost the Australian Open final to fiery American 14th seed Sofia Kenin.
Few would have predicted that either Sofia Kenin or Garbine Muguruza would reach the Australian Open final but they have fought their way through to stand one win from glory.