Watermans' Gary Johnson, Black Boy's Kevin Pringle and Royal Standard's Pete Ewins booked their places in the Men's Individuals competition quarter-finals in the Morrells Oxford League.
At the Black Boy, Johnson knocked out Stephen Sheard 19,290-5,870 over two legs, and then defeated Sid Barrett 11,190-2,000.
Pringle, meanwhile, went through at the expense of Democrats' Eddie Tebby.
Over at the Isis, Ewins bounced back to form with a 9,430-7,730 win over Dave Tooke. He then ousted Bob Pincombe 18,950-5,610 over two legs.
In the Over 50s singles at the Democrats, Dave Bartlett defeated Ian Moquet, Alan Lacey beat Bob Allsworth, and Terry Coleman overcame Dave Rose.
At the Masons, Ken Barrett defeated Robin Hedworth, while Bob Whitehouse knocked up 11,000 in his second game on the way to beating Vikings' Ernie Smith.
LATEST STANDINGS
Premier Section: Watermans A 12 played, 44 pts; Tandem 12, 39; Royal Standard 12, 36; Democrats A 11, 27.
Section 1: Masons 12, 32; Vikings 12, 31; Black Boy 11, 20; South Oxford SC A 11, 16; Democrats B 11, 15.
Section 2: Watermans B 13, 51; South Oxford SC B 12, 40; Prince Of Wales 11, 39; Masons B 13, 37; Bricklayers 13, 29.
Section 3: Shelley 13, 28; Kidlington RTSC 13, 26; Crown 13, 25; Bullnose 13, 23; Isis 12, 15.
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