Okada started his career aged 21 on October 2011. His career record to date stands at 9 wins and he remains unbeaten. The longest KO streak that Okada has ever had is 7 throughout his 9 fights and his longest winning streak is 9 wins. This started on October 2011 and came to an end on July 2014.
A calm Okada made the statement he was hoping for in a 4 round fight against Kazuya Nakano. Claiming the only stoppage defeat of Nakano's career in round 2 of the fight via TKO. Okada built on his successful start to his career by fighting once in 2011 and once in 2013 which included fights against Petchthongchai Sirimongkolgym, Suguru Suganuma and Ryoji Miyagi to name just a few.
Naoki Yamauchi was beaten next on August 7th, 2012 meaning Okada could maintain his unbeaten streak. Yamauchi was stopped in the 1st round via KO crowning Okada as the first person to stop this opponent. Okada then went on to face Suguru Suganuma where he added another win to his tally.
Next was Ryoji Miyagi on March 25th, 2013 where Okada took the win continuing his unbeaten streak. Miyagi was a worthy challenger but Okada was too much and became the first person to stop Miyagi via TKO during round 4. Okada's winning streak went from 5 wins to 7 after he then defeated boxers including Heri Andriyanto and Jaypee Ignacio.
Okada then went on to fight and beat Masayoshi Kotake on March 4th, 2014 maintaining his unbeaten record. In 2014 Okada fought his next opponent in Masayoshi Kotake. A challenging 10 round fight that ended in Okada's favour as the judges awarded Okada the UD victory. Okada was the 8th person to defeat Kotake.
Hiroki Okada retained his unbeaten record in his most recent fight by beating Shamgar Koichi on July 28th, 2014, increasing his record to 9 wins. Shamgar Koichi was little match for Okada, as Okada became only the 6th person to defeat Koichi in his most recent fight. The fight went the distance via UD decision.