Djokovic overcame his latest hurdle to defeat Zizou Bergs and set up a semi-final with the qualifier Valentin Vacherot Join the Miguel Delaney: Inside Football newsletter and get behind-the-scenes access and unrivalled insight Join the Miguel Delaney: Inside Football newsletter Join the Miguel Delaney: Inside Football newsletter Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Novak Djokovic admitted he is “trying to stay