A leading tennis official has called on social media companies to step up protection for female athletes after an incident involving Emma Raducanu in Dubai shone a spotlight on the stalking of leading players. Raducanu, 22, was reduced to tears during a match on Tuesday night, after spotting a man in the crowd who had “exhibited fixated behaviour” when he approached her with a note the previous day. The man was briefly detained by police, signed a formal undertaking to stay away from ­Raducanu and has been banned from future tournaments, but the player’s ordeal raised questions about ­women’s safety...