The United States will play in a Fed Cup World Group II Playoff against host Argentina this weekend, with Serena and Venus Williams leading the way for the heavily favored visitors.
Saturday's opening singles in Buenos Aires will pit the former world No. 1 Venus against 121st-ranked Argentine Paula Ormaechea and the currently top- ranked Serena versus 197th-ranked Maria Irigoyen in this best-of-five affair.