Fresh off her victory in Melbourne, Williams flew to Buenos Aires to represent the USA in their tie against Argentina in the Fed Cup World Group II. Serena was nominated to play her first rubber against Argentine No. 2 Maria Irigoyen. Williams initially struggled to adapt to the clay as the pair went with serve for most of the first set. Williams then won the final eight games of the match to win in straight sets. Williams was nominated to play her second singles rubber against Argentine No.1 Paula Ormaechea; however, she was replaced by Coco Vandeweghe due to illness. USA won the tie 4–1 and advanced to the Fed Cup World Group play-offs.
