Novak Djokovic shares photo with 'amazing human' Maria Sharapova

Tennis star Novak Djokovic on Thursday congratulated five-time Grand Slam champion Maria Sharapova on her retirement and wished for her future endeavors. Djokovic shared a picture of himself with Sharapova and captioned it, "Amazing career. Amazing leader. Amazing human. Thank you for all you've done for tennis @MariaSharapova. I...