Bengaluru: After being dismissed for a paltry 202 in their first innings, Karnataka hit back strongly with skipper and seamer R. Vinay Kumar taking six wickets to bundle out Mumbai for 44 in just 15.3 overs on the first day of the five-day Ranji Trophy semifinal match here Wednesday.

In all, 21 wickets fell on a green top pitch and in near perfect conditions for batting as Mumbai collapsed for their second lowest-ever total, just two runs more than the 42 they made against Gujarat in the 1977-78 season. Mumbai's woes were compounded by the absence of Abhishek Nayar who did not bat owing to an injury.