Nathan Tweedie took the honours in the seventh race in the PACTRAC Mini-Series at Oundle.
He beat arch rival for the series title Paul Vernon by 26 seconds to open up an eight-point lead with three more races to go.
Competing over the usual distances (400 yards, 10 miles, 3.5 miles) Tweedie led the swimmers out of the pool. He was 28 seconds ahead of newcomer Thomas Lane with Vernon back in 14th place.
But Vernon had the fastest bike split on the night and going into the run had moved to just 32 seconds behind Tweedie.
But Tweedie recorded his fastest ever run on the course to stay in front and he finished in 48:13 with Vernon second in 48:39 and Richard Moys third in 53:11.
Fourth was junior Jonathan Oakey in a personal best 53:20.
In the St Neots Triathlon, Andrew Russell (standard distance) and Tim Henson (sprint distance) both came third in their respective age groups with times of 2:40:10 and 1:17:27. Gary Shoemake was fifth in his age group sprint with 1:22:51.
Six PACTRACers competed in the Pitsford Triathlon at the Brixworth Country Park in Northamptonshire.
Sean Pooley was the first clubman home in ninth overall, with both Pooley and Emily John-Davis coming second in their respective age groups.
Results: 9 Sean Pooley 2:16:31 (agegroup 2nd); 29 Nicholas Forscutt 2:29:11 (age group 7th); 39 Craig Mills 2:32:35 (age group 8th); 55 Paul Frampton 2:37:49 (age group 7th); 80 David Pooley 2:46:15 (age group 15th); 120 Emily John-Davis 2:59:57 (age group 2nd).