Djokovic admits to nerves after beating greatest rival Tsonga 

The top seed vanquished the Frenchman, who he described as "one of my greatest rivals", for the 17th time in 23 tour meetings stretching back 11 years and advances to face Denis Shapalov.

Serbia's Novak Djokovic, right, is congratulated by France's Jo-Wilfried Tsonga after winning their second round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 18, 2019. | AP