Saddlers, leaders of Eynsham League Section 1, slipped to a 4-2 defeat at Bletchingdon.
Saddlers lost the first three games before Roger Bowen 7,190 pulled one back.
However, Geoff Powell (11,090) clinched victory for Bletchingdon in the fifth before Mike Walton won the final game.
Tandem stay second after their 4-2 win at Lamb B.
Pete Phillips, with 5,520 against Ruth Collet, saw Tandem home in the final game.
Terry Cook staged a thrilling fightback in the final game to give Royal Oak a 4-2 home win over South Oxford SC B.
Trailing by 7,240 against Steve Huntley, he reeled off an 8,690 break to snatch victory.
Dave Barnes picked up both South Oxford points.
Paul Wood's brace of wins helped Lamb A to a 4-2 win at Robin Hood.
Results: Royal Oak 4, South Oxford SC B 2; Bletchingdon 4, Saddlers 2; Robin Hood 2, Lamb A 4, Lamb B 2, Tandem 4.
TUESDAY'S OPEN PAIRS
1st round (at Bletchingdon): J Bamsey & D Lewis (Tandem) v A Wilson & C Winstone (Kidlington).
2nd round: 1 P Soanes & K Willoughby (Bletchingdon) v K Bull & B Keenan (Robin Hood); 2 T Bull & B Parrott (Robin Hood) v R Bowen & B Bawden (Saddlers). Winner 1 v Winner 2 (at Bullnose Morris).
3 R Collet & E Wain (Lamb) v D Bartlett J M Patey (South Oxford SC); 4 B Allsworth & A Burnham (Bullnose Morris) v P Collett & R Wain (Lamb). Winner 3 v Winner 4 (at Tandem).
OPEN INDIVIDUAL
2nd round (at Bletchingdon): P Phillips (Tandem) v P Farrelly (Kidlington).
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