Christina McHale will play opening singles for the U.S. Fed Cup team when it faces Germany in a critical playoff this weekend without the Williams sisters. The 18-year-old McHale, ranked 82nd, takes on No. 19 Andrea Petkovic on Saturday. Melanie Oudin meets Julia Goerges in the second singles. Reverse singles and doubles, if necessary, are Sunday on the indoor red-clay court in Porsche Arena. More...