Chawla grabbed 3 for 15 to spin out State Bank of Hyderabad for 91 in 12 overs, chasing their rivals' impressive 184-8. He was backed up by Vinit Sinha (2-13) and Shubham Ranjane (2-25).
In other matches, Central Railway defended a small total of 95 against Canara Bank to win by 23 runs while Reliance One was stunned by Mumbai Customs.
CAG beat BPCL by two wickets off the last ball of the match in another game.
Reliance One: 70 in 16.4 overs (Balkrishan Shirke 3-11, Deepak Shetty 2-12, Jude Singh 2-20) lost to Mumbai Customs 71-3 in 8.2 overs (Sumit Ghadigaokar 39 not out, Kishore Kamat 2-7) by seven wickets.
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Central Railway 95 in 19.1 overs (Harshad Rawle 23, Nilkanth Parab 22; NC Aiyappa 3-21, Abhimanyu Mithun 2-16, Vyshak Vijaykumar 2-19) beat Canara Bank 72 in 17.3 overs (Manish Rao 3-10, Salil Aggharkar 2-12, Parappa Mrdi 2-16, Santosh Saxena 2-24) by 23 runs.
D Y Patil 'A': 184-8 in 20 overs (Swapnil Asnodkar 76, Yogesh Takawale 48; Alfred Absolem 3-39, Akash Bhandari 3-53) beat State Bank of Hyderabad 91 in 12 overs (Vishal Sharma 25; Piyush Chawla 3-15, Vinit Sinha 2-13, Shubham Ranjane 2-25) by 93 runs.