Wicketkeeper-batsman Patel's 53 off 44 balls helped India 'B' recover from a dicey 130 for four after they were put in to bat on a good batting strip in the day-night encounter.
Patel shared a vital fifth-wicket stand with Yusuf Pathan (31), adding 58 runs off as many balls and also nursed the lower order with admirable confidence.
Sridharan Sriram was the other notable contributor with 44 off 51 balls that formed the fulcrum of the early part of the 'B' innings.
The Tamil Nadu left hander also featured in a 72-run association with skipper Dinesh Mongia (34) for the third wicket.
For India Seniors, Irfan Pathan claimed 3-39 while Ajit Agarkar and Harbhajan Singh picked two wickets each.
Seniors, led by Mohammad Kaif, had lost the opening match to India 'A' by one wicket at the same venue yesterday.
Earlier, Robin Uthappa and Shikhar Dhawan promised a solid start as they took on the Senior new ball bowlers confidently.
But the partnership was cut short early when the former top edged Ajit Agarkar for a simple catch to Mohammad Kaif at cover while Dhawan was caught behind trying to cut Harbhajan Singh.
Sridharan Sriram and Dinesh Mongia then added 72 runs for the third wicket from 88 balls before the stand was broken when the captain (34) committed hara-kiri with a wild heave off Irfan Pathan.
Sriram looked confident during his 51-ball knock of 44 before a Pathan bouncer cramped him for a hook shot that found Satyajit Parab at backward squareleg.
But any hopes the Seniors might have had after claiming two wickets in the space of seven balls of ploughing through the middle order was dented by Parthiv Patel and Yusuf Pathan.
Sachin Tendulkar received a chorus welcome when he stepped out to bowl but his assorted mix of off spin and slow medium could not break the left-right combination.
The breakthrough came when Yuvraj Singh, having fumbled several chances including a sitter off Sriram, finally managed to hold on to one from Yusuf.
The senior Pathan by that time had made 31 and added 58 runs for the fifth wicket.
With Sunny Singh (0) and Sreekumar Nair (1) falling in quick succession, Patel was running out of partners.
But the diminutive left-hander stood up to the challenge, with boundaries off Pathan and Harbhajan as well as some purposeful running between the wickets.
Patel reached his half century with a glide to short third man off Harbhajan.
His rearguard innings came to an end when he tried an upper cut off Agarkar and was caught at third man by Yadav.