Oxford University suffered their first South League defeat of the season as they went down 5-3 at Staines in Premier Division 1.
Alexander Stobart (2) and Duncan Graves were on the mark for the Dark Blues, who had won nine and drawn four of their previous matches.
They remain top of the table, but Brighton are just two points behind and have two games in hand on the students.
Oxford Hawks went down to a disappointing 2-1 defeat at home to mid-table Spencer.
Andy Seiman got their crumb of comfort.
Oxford were beaten 2-1 by Henley in MBBO Regional Division 1, with Dan Bleach on the mark.
Oxford Hawks 2nd hit OMT for six as Chris Burden (2), Ed Baldock, Drew Blackburn, Jamie Clark and James Gilbert found the target in a 6-1 triumph.
It was Hawks’ 12th win in 14 outings and keeps them firmly at the head of the table.
Wallingford were equally convincing winners, dispatching Aylesbury 5-0 at the Hithercroft.
Veteran Angus Jones and Alun Lloyd put them in command at the break and a superb move involving 20 passes ended with Horatio Cary making it 3-0.
Tim Chamberlain and Steve Marks wrapped up the scoring.
Witney took over at the top of Division 2 with a 2-0 win at home to Amersham & Chalfont. Dan Andrews and Tim Hardy scored the goals.
Bicester went down 2-1 to OMT at Cooper School in MBB&O Division 1. The first half was a lethargic and goalless affair, but OMT were quick to open their account after the break and then added a second.
Adam Drewitt got Bicester back in the game midway through the second half, but it proved merely a consolation.
MBBO Regional Div 2: Oxford 2nd 5 (K Onishi 2, R Beer, T Small, B White), South Bucks 0; Oxford Hawks 3rd 3 (P Poulter, T Turland, T Simpson), Newbury & Thatcham 2nd 0. Div 3: Oxford 4th 2 (J Burke 2), M Keynes 3rd 0; Oxford 5th 0, Wokingham 2nd 3.
Div 4: Maidenhead 3rd 5, Witney 2nd 3 (S Summers 2, B Campion).
Open Div 5: Oxford 6th 6 (P Charrett 2, R Bennett, J Taylor, P de la Fargue, J Williams), OMT 4th 2; Oxford 7th 3 (A Neville 2, S Volans), Witney 3rd 3 (B Moss, A Birnie, R Fitz-John).
Div 8: Aylesbury 4th 4, Witney 4th 2 (C Summers, P Summers).
Div 9: Oxford 8th 0, Gerrards Cross 3rd 3; Oxford Hamsters 1 (R Walker), Thame 2nd 0.
Div 10 West: Oxford 9th 3 (D Haycock, P Troop, S Thompson), Aylesbury 5th 1.
Wessex Masters League Div 1: Oxford Bulls 0, Chichester Priory Park Friars 17.
Oxford Hawks 4th 3, Bicester 2nd 0; Ox-ford Hawks 5th 0, Maidenhead Magicians 1; Oxford Hawks 6th 4 (S Smith 2, W Smith, A Bentley), Newbury & Thatcham 4th 2; Oxford Hawks Senators 5 (D Robins 3, M Crowley 2), Teddington Vets 1; Wallingford 5th 1, Bicester Development 1 (G Cox).