He participated in the 9th edition of Mister India contest. On the final gala held on 14 December 2017 in Mumbai, he won the title of Peter England Mr. India Supranational 2018. He represented India at the Mister Supranational 2018 pageant in Krynica-Zdrój, Poland where he was declared as the winner. He also won the Best Body award in the competition. Prathamesh is the first Asian to win the title of Mister Supranational.
