The 39-year-old nudged one to long leg for a couple to bring up his 18th Ranji hundred.
He is now one short of the Indian record held by Sunil Gavaskar, who scored 81 first class hundreds. In Ranji Trophy, Gavaskar hit 20 hundreds.
Teammate Wasim Jaffer is batting on 130 while Tendulkar is at 102. Mumbai were 257/2 on the first day.