Mochizuki, aged 19, started his career on November 2013. Although still relatively close to the start of his career, his record stands at 5-1-0 and Mochizuki will want to add some more wins to that throughout the next stage inhis career. Mochizuki's longest KO streak is 3 fights long out of his 6 pro career fights.
An explosive pro debut saw Mochizuki face Yuta Oda in a 4 round debut fight. Naoki became only the 2nd person to stop Oda shy of the full distance, stopping him in the 1st. Taking his record to 3 wins, Mochizuki won his next 3 fights continuing his successful career.
On May 8th, 2014 Mochizuki fought and beat Muneyuki Kishii (3-2-0) to continue his unbeaten streak. Continuing his career, Mochizuki fought Muneyuki Kishii in 2014 over 4 rounds. Mochizuki was the 2nd person to go the distance with Muneyuki Kishii.
Next was Yuki Honna on July 31st, 2014 where Mochizuki took the win continuing his unbeaten streak. The win against Honna came in the 1st round of a 4 round fight via TKO. Mochizuki was the 2nd person to stop Honna.
Naoki Mochizuki was defeated by Sonin Nihei on September 26th, 2014 in his next fight. A confident Mochizuki came against his biggest challenge to date on September 26th, 2014, being out-boxed in a 4 round UD loss to Nihei on the judges decision. This was Mochizuki's first defeat as a pro.