Last year's beaten finalist Zheng Qinwen blamed the lack of a warm-up event and a serve clock violation for her shock Australian Open exit in straight sets to German veteran Laura Siegemund on Wednesday.

Novak Djokovic celebrated a slice of Grand Slam history on his way into the Australian Open third round on Wednesday, but last year's women's finalist Zheng Qinwen was knocked out in the biggest shock so far.

By Shrivathsa Sridhar MELBOURNE (Reuters) -Zheng Qinwen was the first big name to exit the women's draw at the Australian Open on Wednesday after the Olympic champion was stunned by Laura Siegemund while top seed Aryna Sabalenka made heavy weather of her second-round match before going through.