Premier League champions Original Swan A suffered their first defeat of the season with a 5-4 reverse at Section 1's Shelley Arms C.
Terry Wood gave Shelley a 1-0 lead with a fine win over Tony Leone.
The Premier side hit back with wins from Jon Jukes, who landed two 180s, and Nick Cobb, but Shelley levelled as Lyndon Richards beat Derek Pringle.
It was 3-3 going into the pairs, which Shelley took 2-1 to complete the upset.
Steve Pladdys starred as Rose Hill Community Centre took a giant step towards the Section 2 title with an 8-1 win at the Three Horseshoes.
Pladdys hit two 180s and threw a 15-dart leg, which he finished with double four, double 11 and double three.
Victories from Bob Boyce, Pladdys, Darren Allen, who also bagged two 180s, Jamie Byles and Jason Tyle gave Rose Hill a 5-0 lead.
Paul Bustin pulled one game back for the Shoes when he beat Dave Witherwick, but Rose Hill took the pairs 3-0.
They are now 11 points ahead of Lord Nuffield Social Club. who have played one game fewer.
Section 3 leaders Red Lion C crashed to a 5-4 defeat at Masons Arms A, which leaves them needing five points next week to be sure of the title.
Section 4 leaders, Marsh Harrier, suffered title nerves when they lost 5-4 to the visiting Bullnose Morris A.
The Harrier now have a three-point lead over Marston British Legion, who narrowed the gap with a 5-4 win at Cricketer's Arms.
THIS WEEK'S 180S D Allen (Rose Hill CC) 2, S Pladdys (Rose Hill CC) 2, R Cook (College Oak) 2, J Jukes (Original Swan) 2, A Povet (College Oak), K Young (The Angel), K Wilkins (Shears), B Freemire (Cowley Workers), M Andrews (Lord Nuffield SC), A Eckart (George Bar B), B McNish (Masons Arms A), M Hutt (Marston RBL), S Tricker (Railway SC D), C Davis (Catherine Wheel B).
THIS WEEK'S 100-PLUS FINISHES D Moss (Lord Nuffield SC A) 170, A Thomas (Final Whistle) 122, R Cook (College Oak) 116, M Wilkes (College Oak) 115, A Eckart (George Bar B) 110, M Juste (Shelley Arms A) 108, C Joy (Bullnose Morris A) 104, G Manning (The Angel) 102, J Palmer (Final Whistle) 102, J Palmer (Final Whistle) 100, P Cohen (Final Whistle) 100.
GREENE KING & ODDA MEN'S RESULTS Premier & Section 1: Shelley C 5, Original Swan A 4; The Shears 3, The Angel 6; College Oak 4, Final Whistle 5.
Section 2: Lord Nuffield A 6, George Bar B 3; Green Rd SC 4, Shelley A 5; Cowley Workers SC 3, Quarry Gate B 6; Three Horseshoes 1, Rose Hill CC 8.
Section 3: Masons A 5, Red Lion C 4; Black Horse A 6, Nuffield Inn 3.
Section 4: Marsh Harrier 4, Bullnose Morris A 5; Nuffield B 6, North Star 3; Cricketers 4, Marston RBL 5.
Section 5: Blackbird Bar 5, Nelson A 4; The Fox 6, Shelley B 3; Railway SC D 7, Somerset House 2.
Section 6: Original Swan B 2, Kings Arms 7; Masons B 5, Follybridge Inn 4; Gladiators SC 4, Red Lion 5.
Section 7: Fairview Inn 3, Black Horse B 6; Red Lion A 2, Headington RBL 7; Red Lion 3, Kennington SC 6.
Section 8: Corner House 1, JR Hospital SC 8; Jack Russell 7, Berinsfield CC 2.
Section 9: Queen's Head 8, Catherine Wheel 1; Red Lion B 6, Masons Arms 0; Shelley D 6, Ampleforth Arms 0.
Section 10: Prince of Wales B 3, Lord Nuffield SC B 6; Crown House 3, Railway SC 6.
LADIES RESULTS Premier & Section 1: Cowley Workers A 6, Gladiators A 3; Quarry Gate C 7, Quarry Gate D 2; Lord Nuffield SC 3, Shelley C 6.
Section 2: Donnington CC A 3, Donnington CC B 6; Crown House A 5, Three Horseshoes 4; East Oxford CC 2, Vikings SC A 7; Florence Park CC 8, Grove House 1.
Section 3: Berinsfield CC A 4, South Oxford SC 5; Follybridge Inn 4, Fox Inn 5; Cricketers 4, Team Monarch 5.
Section 4: Prince of Wales 6, Railway SC B 3; Grove House B 4, Cowley Workers 5; Ampleforth B 2, Berinsfield CC C 7.
Section 5: Democrats Club 4, Catherine Wheel B 5; Shelley A 6, Marston RBL 3; Prince of Wales 6, Crown House 3; Railway SC A 5, Red Lion 4.
Section 6: Ampleforth Arms 6, New Club 3; Fairview Inn 5, Six Bells 4; Golden Ball 4, Masons Arms 5; Catherine Wheel C 4, Bricklayers 5.
Section 7: Quarry Gate B 6, Nuffield Arms 3; Cavalier A 2, Rose Hill CC 7; Shelley Arms 6, Red Lion 0.
Section 8: JR Hospital SC B 3, Jack Russell 6; Gladiators B 7, Somerset House 2.
Section 9: Cowley CC A 5, Cavalier Inn 4; The Priory 3, Corner House 6.
ODDA MIXED FOURS DRAW 1st round (April 5): Three Horseshoes v Rose Hill CC, East Oxford Conservative Club B v Original Swan B, Shelley Arms B v Donnington Community Centre, Shelley Arms v Quarry Gate, Queens Head Horspath Folly Bridge Inn, Original Swan A v Fox Inn, Gladiators SC v Shelley Arms A, East Oxford Cons A v BYE.
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