Tense moment in a difficult first set for Roger Federer against Tomas Berdych. Down 5-3 but leading 15-40 on Berdych's serve, Federer stopped the point and asked for a challenge, but the Hawk-Eye system didn't work. Federer lost his challenge, as a result of the umpire's decision, and asked him: 'Do you feel comfortable with it?' In press conference Federer reflected about what happened: 'It was more just getting his thoughts on the whole situation because I was told now that he knew the call, so he could have told me it was in, which apparently it was, which I thought it was too. But then when he took the challenge away, I just wanted some explanations. So that was it.'