[3][4][5] He made his first title defence against Hisaki Kato during K-1 World GP 2019: K’FESTA 2.
[12] Sina was scheduled to fight Seiya Tanigawa at K'Festa 4, but the event was later postponed due to the COVID-19 pandemic.
[13] He was instead scheduled to fight K-Jee at K'Festa 4 Day 2 for the K-1 WORLD GP Cruiserweight title.
[14] Karimian was scheduled to face the former K-1 heavyweight champion Kyotaro Fujimoto at K-1 World GP 2021: Yokohamatsuri on 20 September 2021.
[17] Karimian faced Kosuke Jitsukata at K-1 World GP 2022 Yokohamatsuri on September 11, 2022.