Bulgarian tennis coach Yulia Berberyan speaks during an interview with Reuters in Sofia October 2, 2008. Berberyan, the mastermind of Maleeva sisters' success, says Bulgaria's double junior Grand Slam champion Grigor DImitrov will have to cope with an immense pressure to break into the men's tennis elite. Picture taken October 2, 2008. To match feature TENNIS-BULGARIA REUTERS/Stoyan Nenov (BULGARIA)