the first round at Wimbledon, but lost in four sets. Nishikori then retired in his first-round match against Flavio Cipolla at the US Open. At the Shanghai Masters, Nishikori reached his first Masters 1000 semifinal. He defeated Robin Haase, fourth seed Jo-Wilfried Tsonga, and Santiago Giraldo, in the first three rounds. In the quarterfinals, Nishikori upset 12th-seeded Alexandr Dolgopolov in straight sets. He lost to No. 2 Andy Murray in his first Masters 1000 semifinal. He reached a career-high of world No. 30, breaking the previous Japanese mark of No. 46, set by Shuzo Matsuoka in July 1992. In the 2011 Swiss Indoors Basel tournament Nishikori defeated an ailing world No. 1 Novak Djokovic to reach the final, coming back from a 4–5, 0–30 deficit in the second set. The win was only Djokovic's fourth loss of the season, second loss in a completed match, and first loss of a completed match on a non-clay surface. Nishikori was defeated in the final by Roger Federer. On the heels of the victory, Nishikori was granted special exemption into the 2011 BNP Paribas Masters in Paris, and achieved a ranking of world No. 24. 2012: First Grand Slam quarterfinal and second ATP title Nishikori started the season at the Brisbane International, where he lost in the second round to Marcos Baghdatis. At the 2012 Australian Open, Nishikori came back from a set down to defeat sixth seed Jo-Wilfried Tsonga to reach the quarterfinals of the Australian Open, where he was then defeated by fourth seed Andy Murray. Nishikori was the first Japanese male player to reach the quarterfinals of the Australian Open in 80 years. Nishikori made it to the quarterfinals of the Hall of Fame Tennis Championships after beating Belgian Olivier Rochus in three sets. In the Summer Olympics, Nishikori lost to Argentina's Juan Martín del Potro in the quarterfinals. He and Go Soeda lost in the first round of the men's doubles. In Toronto, he lost his first match (after a first-round bye) to Sam Querrey. He did better in Cincinnati, making it to the third round before being defeated by Stan Wawrinka, who ended up a semifinalist in the event. Nishikori had also lost to Wawrinka in the quarterfinals in Buenos Aires in February. On 7 October, eighth seed Nishikori won the Rakuten Japan Open in Tokyo against sixth seed Milos Raonic of Canada in three sets to win