If Serena Williams can bagel a fitter, younger opponent in the third set of a semi-final at a slam while appearing to be operating on half a lung and anaesthetised legs – as she did to beat the bewildered Timea Bacsinszky on Thursday – her opponent in Saturday’s final, Lucie Safarova, has no chance. It was a remarkable performance in every way. The two-times champion, the oldest player left standing at 33, coughed and groaned, sweating heavily and dragging her feet across the clay of Court Philippe Chatrier for nearly two hours on the hottest day of the tournament to come back from a set and 3-2 in the second, and won 10 games in a row for a 4-6, 6-3, 6-0 victory she will cherish among many great fightbacks. “I don’t think I have ever been this sick. I can’t believe I won because I got the flu after my third-round match and haven’t been getting better,” Williams told ESPN. “Hopefully, this is the worst and I thought I was going to lose and suddenly I was one set all and thought ‘I really don’t feel like playing a third set because I am so tired’. It is a…