Ready for biggest challenge: Federer

After 6-4, 6-3, 6-3 quarter-final win over Tsonga, Swiss ace takes aim at No 1 Novak DjokovicFive-time champion Roger Federer demolished Jo-Wilfried Tsonga 6-4, 6-3, 6-3 yesterday to reach the US Open semi-finals and gain revenge for his landmark Wimbledon loss to the Frenchman. Third seed Federer will tackle top seed and World No 1 Novak Djokovic for a place in the final after overcoming a 90-minute rain interruption and curtailing the powerful but wayward shot-making of Tsonga.Swiss roll: Switzerland's Roger Federer returns to France's Jo-Wilfried Tsonga during yesterday's US Open quarter-final in New York. Pic/AFPIt will be the fourth successive US Open semi-final meeting between Federer and Djokovic and first since the Swiss ended the Serb's 43-match winning run at the French Open in June. I don't know if what happened in Paris will help him or me. It was a great match and a special win. It was one of the matches of the year, said Federer.Novak DjokovicIt's the biggest challenge in the sport to face him but I'm up for it and I'm playing well. Djokovic progressed to the semi-final after Davis Cupu00a0 teammate Janko Tipsarevic retired with a left thigh injury.Djokovic was 7-6 (7/2), 6-7 (3/7), 6-0, 3-0 ahead.Fed slams scheduleFederer demanded sweeping changes to the US Open schedule after the rain-plagued Grand Slam tournament headed for a fourth successive Monday finish.Playing a Monday final would not matter much to me as I have played my quarter-final, but out of fairness to the other half of the draw, it was the right thing to do, said Federer. The problems lie elsewhere. Three early days for the first round and Super Saturday and Sunday are not feasible.