on Goffin in a straight sets win, before falling in 2 tight sets to Kei Nishikori in the quarterfinals. Vying for Argentina's first title, del Potro played in the 2016 Davis Cup against Croatia. His first match was a four set victory against Ivo Karlović. Partnering Leonardo Mayer, del Potro lost in doubles against Ivan Dodig and Marin Cilic. 2–1 down in matches, del Potro played in singles against Cilic, coming back from 2 sets down for the first time in his career to win in five sets. Described as one of the best Davis Cup comebacks ever, del Potro levelled the score at 2–2, paving the way for Federico Delbonis to complete the comeback by beating Ivo Karlović in straight sets, thus claiming Argentina's first ever Davis Cup title. 2017: Continued comeback, US Open semis Del Potro decided to skip the 2017 Australian Open and made his season debut at the Delray Beach Open, where he was seeded in a tournament for the first time in three years, at No. 7, and won his first three matches against Kevin Anderson, Damir Dzumhur and Sam Querrey, who beat him in the semifinals of the same tournament last year. However, in the semifinals this year, del Potro lost to top seed and world No. 4 Milos Raonic in straight sets. Next, del Potro played in the Mexican Open, where he was drawn to play qualifier Frances Tiafoe, who idolised del Potro when he was a child. In the end, del Potro won an extremely tight match in three sets. In the next round, del Potro played the top seed of the tournament for the second time in a row. This time it was Novak Djokovic on the other side of the court. Del Potro lost in three sets after winning the first set. Del Potro next played at the Indian Wells Masters. Del Potro was seeded 31st so he received a bye into the second round, where he played his Argentine Davis Cup teammate Federico Delbonis. He won in two tight sets. In the next round, Del Potro faced Djokovic again, with the same result, Del Potro losing in three sets. After, Del Potro played at the Miami Open, where he had a comfortable victory over Robin Haase before losing to Roger Federer. Del Potro began his clay-court season at the Estoril Open, where he beat Yuichi Sugita for the loss