By winning Asia 's Under 21 championship in 2009 , Zhang graduated to the main tour .
By winning Asia 's Under 21 championship in 2009 , Zhang moved to Romford , where he plays at the same snooker hall as Ronnie O'Sullivan .
By winning Asia 's Under 21 championship in 2009 , Zhang graduated to the main tour and moved to Romford , where he plays at the same snooker hall as Ronnie O'Sullivan .