Unseeded Vishnu lost 5-7 3-6 to his opponent in the summit clash to end runner-up at the CLTA stadium.
En route to the final, Vishnu had knocked out top seed Jeevan Nedunchenzhiyan and third seed N Sriram Balaji.
Vishnu last won an ITF Futures title in June 2012. He had won back-to-back titles in Bangalore and Mysore in 2012.
Duim though succeeded in ending his title drought. The Dutch had won his last title in April 2012.