A double header had severe consequences at both ends of the Herts Ad Sunday League Premier Division.
Phoenix won both games against Harpenden Colts Old Boys, 3-0 in the first and 2-1 in the second.
Roberto Rosero, Ali Bangura and Jack Muskett got the goals in game one while Robert Calancea got both in game two.
The results mean Phoenix have now jumped to the top of the the tree, level on points with Brookmans Park but with a hugely better goal difference and three games in hand.
Colts meanwhile are bottom and will stay there having played all their league games.
The other games in the division were also part of a double header and they saw Wheathampstead Wanderers move fifth, three points and one place behind the side they played, Six Bells.
The first game finished 1-1, Harry Seeby of Bells cancelling out a Stephen Buckler effort.
Victory in game two would have sent Bells top but they only had a Jack Gage goal to show in a 3-1 defeat.
Buckler scored again and brother Frankie and Jordan Cornes were also on target for Wheato.
The only other league game saw Six Bells Res draw 2-2 with TNF in Division Two.
That still kept them top, four points ahead of Strafford Arms Res, but goals from Jon Tanton and Jay Telford ensured TNF moved four clear of the bottom two.
Brookmans Park not only saw their Premier Division lead disappear on Sunday but they were also knocked out of the Herts FA Sunday Senior Cup too after a 2-1 quarter-final loss at home to Lord Haig of the East Herts Corinthian League.
Adam Page got the Park goal.
There was no county joy either for Hertfordshire Vets who saw their Sunday Junior Cup journey end with a 4-1 loss at Hertford Club De Futbol.
That too was in the last eight, ending the Herts Ad league's involvement in this year's competition.
In the league's own cup matches, St George's won 5-0 against Wheathampstead 89 in the Junior Cup, putting the Division Three leaders into the semi-final.
The Herts Ad Charity Cup currently has one team in the last eight, that being Phoenix Res after a 3-2 success against Royston Rangers.
Brad Golby Solomon and Stan White scored for Royston but efforts from Liam Addlesee and Jack Hague helped Phoenix through.
Royston's reserve team meanwhile won 3-0 away to Hatfield Seniors Res 3-0 in the Reserve Cup, the contest currently being played out in a group of five.
Jack Hutchinson, Dan Moss and Michael Sinnott got the goals.
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