[caption id="attachment_17222" align="alignnone" width="580"]Novak Djokovic and Roger Federer reach second round. File Pic Novak Djokovic and Roger Federer reach second round. File Pic[/caption] Internet Desk: Novak Djokovic and Roger Federer both made serene progress to the second round of Wimbledon with straight-set wins on the opening day. Defending champion Djokovic - trying to win a calendar Grand Slam - beat Briton James Ward 6-0 7-6 (7-3) 6-4. Third seed Federer, troubled by injury problems this year, saw off Argentina's Guido Pella 7-6 (7-5) 7-6 (7-3) 6-3. The Swiss will next play British qualifier Marcus Willis, who stunned world number 54 Ricardas Berankis. Federer, without a Grand Slam title since winning at SW19 in 2012, was below his best but beat the world number 52 in two hours and five minutes. Seven-time champion Federer, who missed last month's French Open because of a back injury, said it was "nice to be back". The Swiss added he was "intrigued" by the progress of Briton Willis, the world number 772. In the first match on Centre Court, Djokovic - searching for his fourth SW19 title - took the first nine games but Ward fought back in the second set, finally getting on the scoreboard in the 10th game, much to the delight of the partisan crowd. But Djokovic - who holds all four Grand Slam titles - showed his class and big-game experience to advance. Meanwhile, in front of new coach John McEnroe, sixth seed Milos Raonic overcame Pablo Carreno Busta of Spain 7-6 (7-4) 6-2 6-4. Fifth seed Kei Nishikori needed a medical timeout but overcame big-serving Australian Sam Groth 6-4 6-3 7-5 in two hours and 10 minutes. Sam Querrey was involved in an opening-round match against Czech Lukas Rosol that lasted three hours and 21 minutes. The American, seeded 28th, won 12-10 in the final set. Querrey had lost the first two sets on tie-breaks but won the next two 6-4 6-2 to force the epic decider. It was nowhere near the record set by John Isner and Nicolas Mahut in 2010,won 70-68 in the final set by Isner after 11 hours and five minutes of play over three days.

Wimbledon 2016: Novak Djokovic and Roger Federer reach second round