MUMBAI, April 9 -- Patrick Mouratoglou, coach of Serena Williams, has penned an emotional letter on social media, asking the "dysfunctional" tennis community to look deeply inwards. The likes of Novak Djokovic and Rafael Nadal are to play in a virtual Madrid Open to raise €150,000 as donation. Georgian world No.375 Sofia Shapatava has started an online petition with change.org, which has garnered 1,800 signatures within a couple of weeks as on Wednesday....