Two weeks of top spin and net returns: Wimbledon by numbers
- Written by The Conversation

Two down, two to go. We are halfway through the Grand Slam tennis season – the Australian and French Opens are passed, the US Open will be staged in September and Wimbledon is now underway. So far, Serena Williams, Novak Djokovic and Stanislaw Wawrinka have taken the major honours, but...