Australian Open 2017: Top 5 upsets from Week-1

#3. Angelique Kerber’s surprise defeat to Coco Vandeweghe

Kerber was stunned by Vandeweghe in straight sets

Angelique Kerber had a terrific season last year as she reached three Grand Slam Finals, winning two; the latter of which helped her dethrone Serena Williams as World No.1. She ended 2016 ranked World No.1 but did not have a very good start to 2017 as she was beaten in the quarter-finals of the Brisbane International by Elina Svitolina which was followed by a disastrous second round defeat at the Sydney International to Daria Kasatkina. Despite this, Kerber was expected by many to defend her title at the Australian Open.Kerber had a shaky start to the tournament as she was pushed to three sets by 51^st ranked Ukrainian Lesia Tsurenko. She had to survive another scare in the second round against compatriot Carina Witthoft. However, she had a comfortable victory in the third round against Kristyna Pliskova in straight sets and was up against 2015 Wimbledon quarter-finalist Coco Vandeweghe.The 36^th ranked American was coming into the match at the back of a grueling three-set encounter against Eugenie Bouchard but she looked as fresh as a daisy on court as she took the first set 6-2. Kerber made a number of errors in the second set which Vandeweghe cahsed on and eventually went on to take the set 6-3, and the match, which helped her reach her second Grand Slam quarter-final.The fourth round exit means that Kerber will lose the No.1 ranking provided Serena Williams goes on to win the tournament. Vandeweghe will now take on last year’s French Open champion and 7^th seed Garbine Muguruza in the quarter-finals.