The win was Guernsey's 19th Siam Cup victory, with Jersey having lifted the title 64 times
Guernsey's men reclaimed the Siam Cup as Jersey won the women's inter-island rugby union title at Footes Lane.
Guernsey's men scored six tries as they beat Jersey 35-27 in their annual clash as they avenged last year's loss at St Peter.
Meanwhile Jersey's women held on win 20-19 and win their title for the second successive year.
Jersey seal clean sweep over Guernsey in Siam Cup
Jersey celebrate despite missing out on perfect season
Guernsey's men held on as Jersey scored two late tries
Ciaran McGann's penalty put Guernsey's men ahead in the opening 10 minutes as they aimed to reclaim the title they lost last year.
Jersey had Dan Barnes sin-binned midway through the half, but the visitors were the ones who took advantage as the prolific Jack MacFarlane scored.
But Guernsey ended the half well against a Jersey side that had won promotion to the fourth tier of English rugby last month.
First Dale Rutledge's try made it 8-7 before McGann added a second penalty and Dom Rice was mauled over just before the break as the Sarnians led 18-7 at half time.
John Dawe raced in from 35 metres in the opening minutes of the second half to make it 23-7.
The hosts looked comfortable and seemed to have put the result beyond doubt when they got a fourth try through Anthony Armstrong with 12 minutes to go to put them 28-7 up.
Barnes pulled a try back two minutes later but within a couple of minutes Guernsey forced a penalty try which saw MacFarlane sent to the sin bin for the remainder of the game.
Fergus Ludlam's long-range try under the posts and Jersey Sexton's close-range effort in the final few minutes ensured a respectable scoreline for the visitors.
Jersey had led by 15 points before Guernsey staged a fightback
Mari De Freitas gave Guernsey's women the perfect start as she crossed in the opening minute to send Footes Lane wild.
But Jersey responded with three tries before half time to lead 15-5 at the break.
First Georgina Ruellan crossed in the sixth minute before Laura Turpin made it 10-5 eight minutes later.
Emily Duncan got the third try just before the interval to out Jersey in control.
Jersey's England Under 21 player Seren Coombs added a fourth try early in the second half as the visitors looked to be cruising to victory as they led 20-5.
But Tanya Scholtz's try cut the gap to 20-12 before Daisy Travers went over to make it 20-19 and set up a tense finish.
"We've been here before and it's gone the other way," Ruellan told BBC Radio Guernsey.
"Last time here in Guernsey it went the other way, and we said this time coming over no matter what we're taking the win.
"We dug really deep there at the end, Guernsey came back at us and they were looking like they were coming back but we held them back."
Listen to the latest Rugby Union Weekly podcast
FA Cup final: Chelsea v Man City – follow live
US PGA round three – charging McIlroy moves into share of lead, Rose, Rahm and Rai in mix
Resilient Celtic time run perfectly to win race after eight-month chase
The globe’s spinning fast. Dive in before the end hits hard
Inside the first Women’s Six Nations Rugby Championship in 2002
The Smoggie Queens are back with more out and proud comedy
The world's first labradoodle
Man City beat Chelsea after brilliant Semenyo goal. Video
Resilient Celtic time run perfectly to win race after eight-month chase
'We crumbled' – another loss, another unwanted record for leaky Liverpool
My quality time with Guardiola – and getting his guide to Barcelona
I'm a passionate lad and I love it at Everton – Pickford
She made what seemed impossible possible – the Rousey show returns
The making of the £60K bargain who became an Everton legend
Parlour? Villa? Gerrard? Ranking best FA Cup final goals
Why Newcastle's history makers are breaking up
Sutton's predictions v Blossoms & Songer
How controversial VAR calls have defined two title battles
Durham to Bedford – Gay's 200-mile drive to tell parents of England call-up
Will F1 go back to the future with its engines?
The summer a golden generation lost its shine
Is 15-year-old IPL wonderkid ready to play for India?
Copyright © 2026 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.
About the Author
