defeated by their compatriots Marcus Fernaldi Gideon and Kevin Sanjaya Sukamuljo in the second round. Setiawan and Saputro also played at the 2018 Asia Team Championships, where Indonesia thrashed China 3–1 to retain the title. Later in February, Setiawan reunited with Mohammad Ahsan and played at the India Open, and they were beaten again by Gideon and Sukamuljo in the semi-finals. To collect BWF ranking points, Setiawan and Ahsan participated at the lower-graded Malaysia International Challenge, and emerged victorious after defeating the home pair of Aaron Chia and Soh Wooi Yik in the final. At the 2018 Thomas Cup, the Indonesia men's team failed to win the title after losing out to China 1–3 in the semi-finals. In July, Setiawan and Ahsan won the Singapore Open by beating Ou Xuanyi and Ren Xiangyu of China in the finals. In the rest of 2018 tournaments, Setiawan and Ahsan best results were being semi-finalists in the Denmark, Fuzhou China, and the Hong Kong Opens. The duo qualified to compete at the World Tour Finals, but at that tournament, they were eliminated in the group stage. He and his partner ended the 2018 season ranked as world number 9. Setiawan and Ahsan were one of the most dominant pairs in the 2019 season, where they entered 11 finals and became the first men's doubles pair to win 3 major titles in a year. Their achievements started at the Indonesia Masters, when the duo finished runner-up to their junior compatriots Gideon and Sukamuljo. The first victory came at the All England Open, when they defeated Malaysia's Aaron Chia and Soh Wooi Yik in the final. This was their second All England title as a pair. They then lost in the finals of the Singapore Open to Takeshi Kamura and Keigo Sonoda of Japan. Setiawan and Ahsan captured their second World Tour title of the year at the New Zealand Open when they beat Japanese pairing of Hiroyuki Endo and Yuta Watanabe in the final in a close rubber game. Setiawan also participated in his fifth Sudirman Cup, and took the bronze medal after Indonesia being defeated by Japan in the semi-finals. In July, they reached two finals, the Indonesia Open and Japan Open, both being runner-ups after losing to Gideon and Sukamuljo in both tournaments. In late August, Setiawan captured his fourth World Championships title. He and Ahsan defeated the up and coming Japanese