Pathan revived Reliance One's tottering innings from 62 for six with his lusty hitting in which he struck six sixes and four boundaries in a match-turning effort in Group C. His knock came off just 48 balls.
Pathan was ably supported by Pawan Negi (27).
Earlier, Reliance One bundled out ONGC for 149.
Mayank Tehlan was the top scorer with 79 runs. For Reliance One, Rishi Dhawan took three for 20, including the wicket of Tehlan, while Baltej Singh claimed two for 27.
In reply, Shikhar Dhawan (1) and Virender Sehwag (9) fell cheaply to medium pacer Sumit Narwal. Parthiv Patel (13) too edged to keeper Salim Ansari in the same over from Narwal.
Three more wickets tumbled before Pathan began his blitzkrieg.
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In another match, Tata Sports Club piled on 211 for 5 in 20 overs before bowling out D Y Patil B for 180 to register a 30-run win and make the quarter-finals.
The other two teams to make it to the knockout stage were State Bank of Patiala and BPCL, who too recorded wins in their final league matches.
Brief Scores:
ONGC 149 in 19.3 overs (Mayank Tehlan 79; Rishi Dhawan 3/20, Baltej Singh 2/27) lost to Reliance One 154 for 6 in 17.3 overs (Yusuf Pathan 81 not out, Pawan Negi 27 not out; Sumit Narwal 3/35, Sarang Rawat 3/33) by four wickets.
Tata Sports Club 211 for 5 (Usman Malvi 32, Nikhil Patil 39, Sujit Nayak 50; Dinesh Salunkhe 2-26) beat Dr D Y Patil B 180 in 17.2 Overs (Vidyut S 33, Kedar Jadhav 59, Dinesh Salunkhe 34; Usman Malvi 2-43, Javed Khan 4-25) by 31 runs.
Mumbai Customs 153 for 9 (Hiken Shah 38, Atul Ranade 37; Jaskaran Singh 4-30, Sanjay Mahajan 2-24) lost to State Bank of Patiala 156 for 4 in 18.2 Overs((Pankaj Dharmani 47 not out; Atish Gawand 2-22) by 6 wickets.
BPCL 217 for 4 (Manish Pandey 88 not out, Vinit Indulkar 43, Suryakumar Yadav 47) beat State Bank of Travancore 107 for 7 (K J Rakesh 49 not out; Avishkar Salvi 3-17, Gaurav Jathar 2-6, Saurabh Netravalkar 2-24) by 110 runs.
