MELBOURNE — Novak Djokovic and Serena Williams reached the fourth round of the Australian Open without having lost a set between them on Friday as the grand slam establishment held firm on day five of the championships.
Tougher challenges will undoubtedly come but the untroubled progress of the two reigning champions and dominant players of 2015 has started to resemble a procession in the first week of the year's first grand slam.
Djokovic, champion for five of the last eight years at Melbourne Park, played a rare match away from Rod Laver Arena but still proved too strong for Italian Andreas Seppi, securing his 210th grand slam victory 6-1 7-5 7-6(6).