Mantri started his collegiate career strong for FDU. The rookie from Singapore went a perfect 6-0 in singles in September and won the "D" singles flight at the Binghamton Championships. Mantri picked up wins over players from Colgate and St. Bonaventure at the Joe Hunt Invite. At the Binghamton Championships, Mantri bested Chicago State's Esi Molefe (6-3, 6-4) and Stonehill's Hayden Grech (7-6, 6-1) in straight sets before defeating Le Moyne's Lorenzo Bortolaso (2-6, 7-6, 10-0) in the final.