Serena Williams is unsure when she will make her grand slam return as the American said winning 25 majors was a goal.
Five months after becoming a mother, Serena Williams is ready to return to competitive tennis for the first time since her 2017 Australian Open title.
Kvitova's victory in the first reverse singles gave the Czechs an insurmountable 3-0 lead in the first-round match and secured a 10th straight appearance in the last four.
Her doubles match revealed the effects of her long time away from the game.
"Right now I'm focused on this weekend and after that I'll figure out what it might be", Williams said on Friday after adding she was unsure if she would play the French Open starting in May. One of those matches proved much closer than the other.
Rinaldi did not rule out the chance of Williams playing singles on Sunday, saying only that adjustments to the current lineup, if any, would only be made after Saturday's action.
In the second singles, Vandeweghe rallied from a set down, winning the second in tense tie-breaker before finding her range against Richel Hogenkamp in a 4-6, 7-6 (8/6), 6-3 victory.
After Venus Williams' singles victory Sunday, U.S. captain Kathy Rinaldi said the Williams sisters would be playing doubles together.
Venus Williams of Team USA serves to Richel Hogenkamp of the Netherlands
After holding serve in the second game of the match, Rus wouldn't win her serve again until she already had lost the first set and was down a break in the second.
"We'll decide tonight", USA captain Kathy Rinaldi said after Saturday's matches.
Williams and Rus exchanged service breaks in the first five games of the second set, with Williams grabbing a 3-2 lead. Her only Fed Cup singles losses came in 1999 to Russia's Elena Dementieva and in 2005 to Russia's Anastasia Myskina. "There's a little bit of altitude here and I like to go big". I think that created some opportunities in the second set, too. I want them, but I don't need them. "I kind of just decided I'm going to sit here and run".
Last year, United States of America won the Fed Cup title for the 18th time, and the first since 2000, extending its record for most Fed Cup titles.
When neither Williams sister played in the Fed Cup past year, Vandeweghe led the U.S.to its 2017 title by going 6-0 in singles matches and 2-0 in doubles.
"She enjoys Fed Cup, and Serena and Venus have been extremely supportive, and it happened to be a good fit".
After Belgium took a lead on a 6-2, 6-1 win by Australian Open semifinalist Elise Mertens against Pauline Parmentier, France's Kristina Mladenovic answered with a 6-2, 6-1 rout of Kirsten Flipkens.