US Open. He first faced David Ferrer in Ferrer's last Grand Slam match, who retired due to injury during the second set. In his semi-final matchup against Juan Martin del Potro, Nadal retired after losing the second set 6–2 due to knee pain. On 31 October, he announced his withdrawal from the Paris Masters due to an abdominal injury and as a result Novak Djokovic replaced him as world No. 1. 2019: Fourth French-US title double, Davis Cup, and year-end No. 1 Nadal was due to start his season at the Brisbane International, but withdrew shortly before due to an injury. He was seeded second at the 2019 Australian Open, where he progressed to his fifth Australian Open final, and did so without losing a set. Nadal then lost in straight sets to Novak Djokovic, winning only eight games for the match and marking Nadal's first straight-sets defeat in a major final. Nadal next played at the Mexico Open, where he lost to Nick Kyrgios in the second round despite holding three match points. He withdrew from both Indian Wells and Miami due to a right hip injury. Nadal began the clay season at the Monte Carlo Masters, reaching the semifinals, where he was upset by Fabio Fognini in straight sets. He then competed in Barcelona, reaching the semifinals where he lost to Dominic Thiem in straight sets. In Madrid, he reached his third clay-court semifinal of the year, but lost to Stefanos Tsitsipas in three sets. He won his first tournament of the year in Rome, with a three-set win over Djokovic in the final. At the 2019 French Open, Nadal defeated Kei Nishikori and Roger Federer (their first meeting at the tournament since 2011) en route to the final, dropping only one set en route. In a rematch of the previous year's final, Nadal prevailed in four sets against Thiem to claim his record-extending twelfth French Open title. In doing so, he broke Margaret Court's all-time record of singles titles won at the same major. Nadal next played at Wimbledon and, like the previous year, reached the semifinals, where he faced Federer for the first time at Wimbledon since the 2008 final. Nadal lost the match in four sets. At the Rogers Cup, Nadal was the defending champion and top seed. By defeating Fabio Fognini in the quarterfinals, he surpassed Roger Federer's record of 378 victories at Masters