Stan Wawrinka had his best ever start to an ATP World tour season, winning the Aircel Chennai Open defeating Édouard Roger-Vasselin in straight sets in the final before going on to clinch his maiden Grand Slam trophy at the Australian Open, defeating Djokovic in a 5-set thriller in the quarterfinals, followed by a win over Nadal in the final. His 13-match winning streak was eventually ended in the fourth round of Indian Wells, losing to Kevin Anderson in three sets. After helping Switzerland to the Davis Cup semifinals, Wawrinka won his first ever Masters 1000 title, defeating countryman Roger Federer in the final of the Monte-Carlo Masters. Following this win, he suffered a dip in form, only winning one of his next four matches, including a first round loss to Guillermo Garcia-Lopez at the French Open. He had his best ever grass court season, making the semifinals of the Queen's Club championships before reaching his first ever Wimbledon quarterfinal, losing to eventual finalist Federer in four sets. Wawrinka reached the quarterfinals at the US Open, losing to eventual finalist Kei Nishikori in five sets. He and countryman Federer then combined to reach the Davis Cup final for only the second time in the country's history, Wawrinka winning his singles and the doubles rubbers. However, Wawrinka suffered a three match losing streak, losing his first matches at the Asian swing and Swiss Indoors Basel, he snapped the losing streak at the BNP Paribas Masters defeating Dominic Thiem but lost in the next round. This is the second time Wawrinka has qualified for the ATP World Tour Finals, having made his maiden appearance in 2013.