The top seed and world No 1 was left reeling after losing 12 of the last 13 games in a shocking defeat to Diana Shnaider which she said made her feel like quitting tennis Inside Sport newsletter: Get an expert guide to the biggest moments shaping the world of sport Get our free Inside Sport newsletter Get our free Inside Sport newsletter Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice What the blistering heat and sun did