Sheffield Tigers stepped up their National Three North promotion hopes when they racked up seven tries in their 39-0 victory over Westoe at Dore Moor.
Tigers were soon up and running with Aaron Langan breaking through from the second row to crash over.
On 25 minutes, Lee Monks scored a second and Tom Outram added the conversion.
A Henry Packard brace, along with tries from Stefan Destounis, Joe Taylor and Adam Shaw made sure of the resounding win.
Waterloo, previously ahead of Tigers on scoring difference, suffered a 10-7 defeat at mid-table Burnage.
Sheffield retained their commanding lead in North One East but were lucky to escape with an 8-7 win on at Alnwick.
The Abbeydale Park side turned round 5-0 ahead after a try from No 8 Johnny France, but Alnwick replied with a converted try and Sheffield had to snatch the honours when fly-half Jimmy Pearson landed a drop goal three minutes from time.
Sheffield are 14 points clear of second placed Percy Park, beaten 23-22 at Wheatley Hills.
Dinnington lost out 23-21 to East Yorkshire outfit Driffield in a thriller.
Jalan Farris, John Dudley and captain Ryan Donscored the Dinnington tries.
In Yorkshire One, Wath on Dearne pulled off a shock 18-17 home win over third placed Yarnbury after turning round 17-5 down. Wath snatched it with the last play of the game when No 8 Matt Burrows crashed over.
Wath had earlier tries from James McCarthy and Joe Bartlett with Thomas Quinn adding a penalty.
Yorkshire Two contenders Barnsley lost 8-5 at second bottom side Ripon, winger Ashley Salkeld touching down.
Stocksbridge romped to a five-point victory at Rotherham Phoenix, winning 24-0 in Yorkshire Three match.
* Tigers v Westoe is our match of the day picture spread in Grass Roots on Friday.