Manoj Parmar, who became the first batsman to top 1,000 runs in a Cherwell season last year, carried on where he left off with an unbeaten 100 as Thame scraped home by one wicket at Sandford St Martin.
Shipton paceman Paul Snell follows this delivery in the eight-wicket win against Banbury Twenty in Division 1
Parmar's ton saw Thame squeeze in at 165-9 - despite the efforts of Chas Taylor (3-26) and Ollie Murrey (3-44).
Earlier, Sandford had slumped to 78-5 after deciding to bat first before rallying thanks to Paul Tew (50 no) and Ian Johnson (43 no) to finish at 162-5. Ian McStay was Thame's best bowler with 4-38.
*Thame 30, Sandford St Martin 16
Cumnor were involved in a thrilling high-scoring draw against Buckingham - with the two sides finishing on level scores in a dramatic finish.
Steve Beck rattled up an unbeaten 162 as visitors Buckingham totalled 257-6, thanks in no small measure to a hatful of dropped catches.
Malcolm Evans (91) and Ian Crosby (46) led Cumnor's spirited reply. But, with the scores level, Reece Morgan (4-80) took his fourth wicket with the last ball of the innings to leave Cumnor having to settle for a draw on 257-7.
*Cumnor 16, Buckingham 17
Jason Constable heralded his return to Shipton-under-Wychwood by taking 4-45 to set last year's runners-up on the way to an easy eight-wicket win against champions Banbury Twenty.
Constable's spell saw the visitors slump to 140 all out, Steve Partington making 37.
Shipton lost Steve Bates in their second over, but Stewart Gillett saw his team home at 142-2 with an unbeaten 68.
Shipton 30, Banbury Twenty 8
Mohsin Rana produced a fiery spell of bowling to pick up 5-44 and set Rover Cowley on the way to a four-wicket win over Kimble .
Salman Fazal (44 no) provided the only resistance as last year's Division 2 champions collapsed to 119 all out.
Fazal then bowled unchanged, but was unable to stem the tide as Stewart Laudat (31) steered Rover to 120-6 and maximum points.
*Rover Cowley 30, Kimble 10
Steve Roberts (44) and Luke List (35) figured prominently in Oxford Downs's 202-6 after they were asked to bat first at Challow & Childrey.
List then picked up 6-54 to peg Challow back to 182-9 after good knocks from Julian Penney (56) and Mark Powell (59).
*Challow 4, Oxford Downs 18
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