Sudbury Rugby Club opened up a seven-point lead at the top of London Three North East after a dramatic finish at Whittome Field.
Against second-placed Cantabrigian, the result hung on the last kick of the game, but the visitors’ penalty kick at 15-14 down went wide, sparking jubilation among a crowd of around 200.
Toby White had given the Blues a fourth-minute lead, but they were forced on the backfoot and trailed 7-5 at the break.
Cantabs scored a converted try at the start of the second half, but a penalty from Tom Summers followed by an all-important try from Ben Stanton proved to be enough for the victory, just.
In football, AFC Sudbury came from behind to edge out Cray Wanderers 2-1 at the Wardale Williams Stadium.
Correy Davidson and Ben Robinson netted inside the final 15 minutes to lift the Yellows to sixth in Ryman One North.
Hadleigh United crashed out of the FA Vase at the hands of lower-league outfit Great Yarmouth Town.
The Brettsiders, who reached the quarter-finals two seasons ago and the fifth round last year, were beaten 2-0 in this campaign’s second round.
Long Melford returned to the top of the Thurlow Nunn League Premier Division with a 4-1 triumph over Dereham Town Reserves.
Jack Durey bagged a brace and there was a further goal each for Sam Bayliss and Jamie Griffiths.
Halstead Town’s promotion hopes suffered a dent as they lost 4-3 at Debenham LC.
Cornard United’s home clash with Woodbridge Town fell victim to a waterlogged pitch.
Ipswich Town twice came from behind to draw 2-2 with fellow promotion-chasers AFC Bournemouth in the Sky Bet Championship, while faltering Norwich City drew 3-3 at home to Brighton and Hove Albion.