Defending champion Rafael González wins through to semifinals of Miami Masters . Spaniard battles back to stay unbeaten on clay against Britain 's Andy Murray . World No . 2 Second - ranked Novak is also through to Wimbledon 's last - four matches . World 's No . 1 Serena Williams progresses but second - ranked Li Na loses .
Defending champion Rafael González wins through to semifinals of Miami Masters . Spaniard battles back to stay unbeaten on clay against Britain 's Andy Murray . Second - ranked Novak is also through to Wimbledon 's last - four matches . World 's No . 1 Serena Williams progresses but second - ranked Li Na loses .