appendicitis. He lost his opening match to Feliciano Lopez in straight sets. Later, he was upset by Borna Ćorić at the quarterfinals of the 2014 Swiss Indoors. After the loss, he announced that he would skip the rest of the season to undergo surgery for his appendix. 2015: Continued struggles and rankings drop Nadal began the year as the defending Champion at the Qatar Open, but suffered a shocking three set defeat to Michael Berrer in the first round. He won the doubles title with Juan Mónaco. At the Australian Open, Nadal lost in straight sets to Tomáš Berdych in the quarterfinal, thus ending a 17-match winning streak against the seventh-seeded Czech. In February, Nadal lost in the semifinals to Fabio Fognini at the Rio Open, before going on to win his 46th career clay-court title against Juan Mónaco at the Argentina Open. Nadal then participated at the Indian Wells and Miami Open but suffered early defeats to Milos Raonic and Fernando Verdasco, in the quarterfinals and third round respectively. Nadal then began his spring clay season at the Monte Carlo Masters and reached the semifinals where he lost to Novak Djokovic in straight sets. After losing to Fognini again at the Barcelona Open quarterfinals, Nadal entered the Madrid Open as the two-time defending champion but lost in the final to Andy Murray in straight sets, resulting in his dropping out of the top five for the first time since 2005. He then lost in the quarterfinals of the Italian Open to Stan Wawrinka in straight sets. Nadal lost to eventual runner-up Djokovic in the quarterfinals of the French Open, ending his winning streak of 39 consecutive victories in Paris since his defeat by Robin Söderling in 2009. Nadal went on to win the 2015 Mercedes Cup against Serbian Viktor Troicki, his first grass court title since he won at Wimbledon in 2010. He was unable to continue his good form on grass as he lost in the first round of the Aegon Championships to Alexandr Dolgopolov in three sets. Nadal's struggles continued when he lost in the second round of Wimbledon to Dustin Brown. In the third round of the 2015 US Open, Nadal once again lost to Fognini, despite having won the first two sets. This early exit ended Nadal's record 10-year streak of winning at least one major. 2016: Olympic doubles gold medal Nadal started the year