Suchith (6/60) ran through Bangladesh A's middle and lower order to help Karnataka bowl out the visitors for 309 in their second innings, thereby setting up a target of 181 runs to win before the hosts, which they overwhelmed in 40.5 overs by losing six wickets.
Skipper CM Gautam scored a quickfire 49 off 35 balls, while Shreyas Gopal remained unbeaten on 40. Other notable run getters for Karnataka during their chase were Abhishek Reddy (36), Shishir Bhavane (24) and Mayank Agarwal (23).
Earlier resuming their second innings at the overnight score of 188 for three Liton Das (38) managed to add just one run to his last night's score before he was dismissed by medium pacer Muralikrishna Prasidh Krishna, caught by Robin Uthappa in the second over of the day.
Liton's overnight partner Soumya Sarkar (43) added 19 more runs against his name before pacer HS Sharath induced an edge from the left-hander which was gladly accepted by Gautam.
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Thereafter, Nasir Hossain (44) and Shuvagata Hom (50 not out) shared 61 runs for the sixth wicket before Suchith came to the party and destroyed Bangaldesh A's innings.
Brief Scores: Bangladesh A 138 and 309 (Anamul Haque Bijoy 89, Shuvagata Hom 50 not out, Nasir Hossain 44, Soumya Sarkar 43; Jagadeesha Suchith 6/60).
Karnataka 1st Innings: 287 and 185 for six in 40.5 overs (CM Gautam 49, Shreyas Gopal 40 not out; Al-Amin Hossain 2/23).