Question: Who has the best head to head record against serena williams?
qaPairs: question: Whoo has the best head to head record against serena williams of number 1 ranked players?
answer: Arantxa Sánchez Vicario
question: Who has the best head to head record against serena williams of number 2 ranked players?
answer: Petra Kvitová
question: Who has the best head to head record against serena williams of number 3 ranked players?
answer: Elena Dementieva