The Jersey duo won on a tie-break at Grainville after sharing one-set each in the final.
De Sousa and Greechan came from 4-0 down in the first set, against Ireland’s Andrew Kyle and Chloe Watson, to go 6-4 ahead, only to finish 8-7 behind.
It was a similar story in the second set as they went 3-0 down, but the Caesareans bounced back in style – drawing level with a 7-6 set victory before De Sousa played the match-winning shot in the one-end play-off.
Full story in Friday’s JEP.