Sarfaraz Khan was unbeaten on 169 as Mumbai finished the day with a sore of 352/4 against Madhya Pradesh.
Karnataka played out a draw against Uttar Pradesh while defending champions Vidarbha thrashed Rajasthan by an innings and 60 runs.
Ranji Trophy: Abhimanyu Mithun took six wickets to help Karnataka bowl Uttar Pradesh out for 281 runs, while Andhra Pradesh ended day 2 in a commanding position against Delhi.
Karnataka's Abhimanyu Mithun finished his spell with figures of five for 39 during Syed Mushtaq Ali trophy semi-final against Haryana.
Vijay Hazare Trophy: Abhimanyu Mithun claimed five wickets, including a hat-trick, while Mayank Agarwal top scored for Karnataka with 69 not out.
Abhimanyu Mithun became the first Karnataka bowler to take a hat-trick in the Vijay Hazare Trophy.
Abhimanyu Mithun claimed a third five-wicket haul of the season as Vidarbha were bundled out for 185. In reply, Karnataka ended the day at 36 for three on the opening day of their Ranji Trophy semi-final clash.
Gautam Gambhir-led India Blue, who scored a mammoth 707, dismissed India Green for just 237 runs and virtually secured its place in the final of the Duleep Trophy
Abhimanyu Mithun will get engaged to south Indian actress Radikaa's daughter Rayane Radikaa on September 23.
Manish Pandey hit 123 not out before Abhimanyu Mithun ripped through the top order to help Karnataka thrash Rest of India by 246 runs on the fourth and penultimate day.