[1][2][3] After performing well in spring training, Hamada earned a spot in the starting rotation for the 2016 season where on 30 March he faced up to the Hiroshima Carp in an 11-3 loss.

[4] Hamada would give up five walks, eight hits and seven earned runs in his four innings pitched.

[6] On 24 April 2017, Hamada underwent surgery for ulnar nerve palsy in his left elbow[7] and although was unable to pitch that year, was re-signed at the end of the season.

[8] On 27 June 2018, he returned to the mound in the first time in two years against the Orix Buffaloes in the Western League, but it was later discovered Hamada has a blood circulation defect in his left arm where he underwent surgery once again.

[9] Hamada pitched in 17 games on the farm for an 8.77 ERA but was given a full-time roster deal ahead of the 2020 season, being assigned the #69 jersey.