We already have one man in the last four .
It 's John Isner , the big serving American has been playing well in recent week and needed three sets to beat Jack Sock and become the first man into the semi-final .
We already have one man in the last four , and it 's John Isner , the big serving American has been playing well in recent week and needed three sets to beat Jack Sock and become the first man into the semi-final .