Goffin. In October, Mannarino reached his third ATP World Tour singles semifinal of 2017 at the Kremlin Cup, where he lost to Ričardas Berankis. The following week, the 7th seeded Mannarino lost in the quarterfinals of the Swiss Indoors to top seed Roger Federer in three sets. 2018: Australian Open third round & top 25 singles debut Mannarino played his first tournament of 2018 at the Sydney International. Seeded fifth, he reached the quarterfinals and lost to fourth seed Fabio Fognini. Seeded 26th at the Australian Open, he reached the singles main draw third round for the first time in his career where he lost to fifth seed Dominic Thiem in straight sets. Mannarino made his Davis Cup debut in the 2018 Davis Cup World Group first round tie against the Netherlands, replacing Lucas Pouille who had withdrawn a few hours before the start of his first singles match on 2 February against Thiemo de Bakker because of torticollis. Mannarino lost his first singles match against Thiemo de Bakker (who was world no. 369 in the ATP singles rankings) in three sets but won his second singles match against Robin Haase in five sets to give the French an unassailable lead against the Dutch. In the first week of February, the second-seeded Mannarino was upset by the unseeded Marcos Baghdatis in three sets in the second round of the Sofia Open. One week later, the fourth-seeded Mannarino lost in the semifinals of the New York Open to the second seed Sam Querrey in three tight sets. Mannarino lost before the quarterfinal round of the singles main draw of his next four ATP World Tour tournaments in Acapulco, Indian Wells, Miami and Monte-Carlo. Despite these results he reached a career-high singles ranking of No. 22 on 19 March 2018. At the Barcelona Open, the 11th-seeded Mannarino held three match points in the final set of his third round match against the 5th-seeded Pablo Carreño Busta before the latter won the match by winning the tight final-set tie-break. 2019: Maiden ATP Tour singles title in Rosmalen Mannarino started his 2019 season at the Qatar ExxonMobil Open. He lost in the first round to Dušan Lajović. In Sydney, he was defeated in the first round by Australian wildcard Jordan Thompson. At the Australian Open, he fell in the first round to fifth seed Kevin Anderson. As the top seed at the Open de