All-Star Game 2014. On September 3, Hasegawa injured his right ankle in a close play at home base against the Orix Buffaloes. In 2014 season, he finished the regular season in 135 games with a batting average of .300, a 6 home runs, and a RBI of 55. And he participated in the 2014 Japan Series. On December 4, Hasegawa had surgery on his right ankle. In 2015 season, Hasegawa finished the regular season in 30 games with a batting average of .224, a 5 home runs, and a RBI of 12. And he participated in the 2015 Japan Series. 2016–2021 season In 2016 season, Hasegawa selected MAZDA All-Star Game 2016. On August 27, he recorded a total of 1,000 hits. He finished the regular season in 122 games with a batting average of .271, a 10 home runs, and a RBI of 51. In 2017 season, Hasegawa only participated in 23 games. However, he contributed to the victory by recording his first home run in the Japan Series in the 2017 Japan Series. On November 21, he underwent reoperation on his right ankle. In 2018 season, Hasegawa's return was delayed to June 15 due to the effects of surgery, but he finished the regular season in 55 games with a batting average of .287, a 5 home runs, and a RBI of 20. And he participated in the 2018 Japan Series and recorded a RBI hit in Game 4. In 2019 season, Hasegawa only participated in 25 games. However, he contributed to the team's third consecutive victory in the Japan Series by scoring a Sacrifice fly in the 2019 Japan Series Game 3. On July 6, 2020, Hasegawa left the team due to a muscle contusion on his right flank. On August 1, he underwent a Polymerase chain reaction for Coronavirus disease 2019 and was tested positive. Partly because of that, his return was extended until September 29, with only 29 games played. However, he participated in the 2020 Japan Series and contributed to the team's fourth consecutive victory. On October 8, 2021, Hasegawa announced his retirement, and a press conference announcing his retirement was held on the following day, the 9th. On October 21, he entered the game against the Hokkaido Nippon-Ham Fighters in the bottom of the 7th inning as a substitute and finished his last active at bat. After the game, a retirement ceremony was held