At Sun Bowls Club at First Tower, Davis retained his crown after defeating fellow Sun member Scott Baxter 21-12 to book a place at the British Isles Championships in Scotland next June, where he will defend the British title that he won earlier this year.
Grimes, of Jersey Bowling Club, won the women’s singles final 21-5 against Sun BC’s Joan Renouf.
It was a busy two days of Bowls Jersey finals with 21 taking place and there was extra incentive for bowlers as the singles, pairs, triples, fours and Over-55 fours winners, men and women, were playing for British Isles Championships places.
Davis’ singles success on Sunday followed up his 17-16 pairs victory, partnered by Malcolm De Sousa, against Scott Baxter and his father Raymond.
Davis, Bowls Jersey’s men’s Champion of Champions winner for the past two years, said: ‘The singles final was a good standard and a good game.
‘Scott left me a few chances and I was able to take them with a couple of threes to open a lead.
‘It’s nice to know that I will now be defending the British Isles singles title and I will be playing in the pairs as well with Malcolm De Sousa.
‘Malcolm and I beat Scott and his father, Raymond, in what was an incredible game which we won on an extra end.
‘Scott was on fire throughout and Malcolm played some big bowls for us to stay in touch.
‘We were a shot ahead going into the last end only to be pegged back before winning the extra end.
‘But it was close though as Scott missed the jack by millimetres three times.’
St Brelade BC’s Thomas Greechan, Mike Videgrain and Graham Thomas will attend a second consecutive British Isles Championship after retaining the men’s triples title, 20-12 against Davis and his Sun BC team-mates Scott Ruderham and Steve de Ste Croix.
JBC’s Alan Quémard, Cyril Renouf, Alan Shaw and Derek Boswell secured a 26-10 success over JBC’s John Lowery, Mark Kaleta, Steve Farnden and David Anderson.
And there was success, too, for St Saviour BC’s Mervyn Richardson, Brian Bisson, Peter Le Long and Mick Baudin in the men’s Over-55s final, 22-19 against last year’s winners, JBC’s Rob Clive, Roddy Macdonald, Alex Stewart and Jim Douglas.
Jarad Brown also retained the men’s U25 title, 21-10 in an all-JBC final against Jack Gaston.
Grimes also won the ladies O55 fours 18-12 in an all-JBC game with Jean Holmes, Sheila McGinnigle and Jane Mayo against Sue Noel, Josie Gregory, Rocio Driver and Carolyn Staley.
The same quartet won last year’s final as well with Lorraine Bowman replacing Holmes in the British Isles were they gained the gold medal.
Grimes and McGinnigle, last year’s British Isles runners-up, went down 21-7 to St Brelade BC’s Ethel Southern and Liz Simon in the women’s pairs.
Grimes said: ‘I dominated my singles match and Sheila and I didn’t get our game together in the doubles and we were disappointed with that as we’d won the last three finals, along with the silver medal at the British Isles last year.
‘A new mixed fours competition with players from different clubs was introduced this year as well and I played with Sun Bowls Club’s Malcolm De Sousa, Scott Ruderham and Kim Gallichan and we were successful in that.
‘It’s the first one and I think it will gain in popularity as you partner anyone.’
In the ladies triples, Sun BC’S Jackie Knight, Eileen Vowden and Cathy Le Sueur emerged 17-11 winners against St Brelade BC’s Trish Le Ruez, Rosemary Godel and Liz Simon.
St Brelade’s Brenda Foord, Freda Videgrain, Ro Le Boutillier and Gwen Stark won the ladies fours final, 21-16 against Sun BC’s Joan Renouf, Jackie Knight, Eileen Vowden and Cathy Le Sueur.