Champion Novak Djokovic is top men 's seed for Champion Novak Djokovic . Wimbledon is ahead of Rafael Nadal and Serena Williams . Fourth seed Maria Sharapova loses warmup match . Roger Federer is top seed in women 's singles , with Serena Williams sixth .
Champion Novak Djokovic is top men 's seed for Wimbledon . Serbian is ahead of Rafael Nadal and Roger Federer . Fourth seed Andy Murray loses warmup match . Maria Sharapova is top seed in women 's singles , with Serena Williams sixth .