So what does that mean? Well it means that Djokovic is not guaranted a place in the semis, as if he loses to Berdych it will come down to games won. These round-robins are a touch confusing aren't they? Let me know what you think on Twitter @Reda_Eurosport. Thanks for joining me, I'll be back tomorrow for the Group B matches, with Federer facing Ferrer and Del Potro up against Tipsarevic. Cheers.