Abingdon Vale's Nicholas Schneider took a hat-trick in figures of 3-7 as his side cruised to a nine-wicket victory over Witney Swifts in the Ron Maudsley Under 13 Trophy.
Tom Guntrip also took three wickets in an over as Swifts struggled to 51-8.
Schneider then scored 21 not out as Vale eased home.
The highest score of the day came at Oxford & Bletchingdon Nondescripts, where Shrivenham posted 145-7, despite a hat-trick from Nondies' Harry Platt.
Max Labouchere, Benjamin Richards and Drew McHenry all made 30s for Shrivenham.
The hosts then slumped to 55-5 in reply.
A fine all-round display from Alex Gordon saw holders Kennington reach the third round with a 27-run victory over Minster Lovell.
Gordon scored an unbeaten 31 as Kennington posted 124-3, before taking 2-11 as Minster were restricted to 97-6.
Banbury moved through with a 26-run victory over Didcot.
Connor Williams (32no) and Josh Megson (27no) formed the backbone of Banbury's 111-6, and Megson followed up with a spell of 3-7 as Didcot reached 85-6.
Oxford B saw off Great & Little Tew by six wickets.
Jaspar Khawaja took 4-10 to restrict Tew to 61-8, all of the wickets falling to catches.
Oxford got home at 62-4, Bilal Hamid hitting 23.
RESULTS Cumnor 79-6 (B Hambridge 30no, D Todd 2-16), Horspath 80-2 (H Hussain 30no, E Neil 25no).
Great & Little Tew 61-9 (K Khauraja 4-10), Oxford B 62-4 (B Hamid 23no, M Watling 2-5).
Banbury 111-6 (C Williams 32no, J Megson 27no), Didcot 85-6 (C Morrison 31no, J Megson 3-7).
Witney Swifts 51-8 (N Schneider 3-7 inc hat-trick, T Guntrip 3-3), Abingdon Vale 52-1 (N Schneider 21no).
Kennington 124-3 (A Gordon 31no), Minster Lovell 97-6 (D Shepherd 30no, A Gordon 2-11).
Tiddington 63-7, Ox Downs 66-6.
Eynsham 71-3, Oxford A 72-6 (T Davis 20no).
Shrivenham 145-7 (D McHenry 33no, B Richards 30no, M Labouchere 30no, H Platt 3-21 inc hat-trick), Ox & Bletch Nondies 55-5 (D McHenry 2-7, H Fox-Edwards 2-11).
Freeland 91-6 (W Potter 26), Charlbury 88-7 (J Garrett 30no, C Milner 25).
Ducklington 83-4 (T Costley 31no, J Allen 30no, J Bardsley 2-11), Bampton 82 (T Landray 29, S Ward 22no, E Priest 4-8).
Combe 93-6 (S Dobson 30no, J Sandelson 23, J Wynne 3-10), E&W Hendred 28 (K McCall 2-2, S Kellie 2-3, J Ayris 2-9).
Aston Rowant A 127-8 (J Stacey 32no, J Wade 30no), Kidlington 66-9 (J Foster 32no).
Minster Lovell Swifts 72-7 (J Merriman 29), Shipton 65 (K Lewis 3-3, H Crowther 3-8).
Challow & Childrey 80 (B Skinner 35no, J Hawkes 3-21, W Sutcliffe 2-10, J Adams 2-4), Thame 81-3 (J Dack 26, W Sutcliffe 24).
Buscot Park 89-2 (H Steven 30no), Bicester & NO 75-8 (D Clarke 24no, N Moody 2-8, L Ward 2-14).
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