was Barcelona, where after beating Guido Pella and 13th seed Cristian Garín, he took a set off Rafael Nadal before losing in the third round in three sets. Nishikori reached the second round in Madrid, and the third round in Rome, losing both matches to Alexander Zverev. He recorded his best Grand Slam result in over a year at the French Open, beating Alessandro Giannessi and 23rd seed Karen Khachanov in five sets. After his third round opponent, Henri Laaksonen retired, he progressed to the fourth round, losing once again to Zverev. His grass court swing was much more quiet, losing in Halle to Sebastian Korda and in Wimbledon to Jordan Thompson. At the Olympics, Nishikori recorded his first top 10 win since 2018 by beating Andrey Rublev in straight sets in the first round. He also beat Marcos Giron and Ilya Ivashka to reach the quarterfinals, where he lost in straight sets to Novak Djokovic. Nishikori then participated in Washington, where he beat Sam Querrey and 9th seed Alexander Bublik in straight sets. He then beat Cameron Norrie to reach the quarterfinals. There, he beat Lloyd Harris in straight sets to advance to the semifinals. He lost to Mackenzie McDonald in three sets. He reached the third round at the 2021 US Open. 2022: Hip surgery On January 25, 2022 Kei Nishikori announced that he will be undergoing arthroscopic surgery on his left hip and will be aiming to come back on tour in about six months. 2023: Projected comeback Nishikori announced he was aiming to be able to return for the 2023 Australian Open, stating that he has a 'strong desire' to return. However, two weeks before the start of the tournament he announced he is still struggling with an ongoing foot injury and delayed his return to an undisclosed date. National representation Davis Cup Nishikori made his Davis Cup debut for Japan in April 2008 in the Asia/Oceania Zone Group I semifinal against India in New Delhi. He was 18 years and 104 days old, the youngest player to play for Japan. He played the singles rubber on the first day, but lost to Rohan Bopanna in five sets. He then defeated Mahesh Bhupathi in a dead rubber to record his first Davis Cup match win. To date, Nishikori has compiled a 19–3 win–loss record overall (17–3 in singles and 2–0 in doubles). In the 2014 Davis