For RCF, Santosh Upadhye (64 in 44 balls) and Shivam Dubey (53 not out in 23 balls) did the star turn with the bat.
They got good support from Virendra Kambli, younger brother of former India batsman Vinod, who contributed with a stylish knock of 39.
For MTNL, Rajan Mungekar ploughed a lonely furrow with the bat in making 30 in 39 balls.
RCF would meet Hindustan Petroleum in the final.
Brief scores: RCF 178 for 3 (Santosh Upadhye 64 (44b, 6x4, 1x6), Shivam Dubey 53 not out, Virendra Kambli 39) beat MTNL 96 for 4 (Rajan Mungekar 30).
