Sutton were made to work hard against a stubborn Knowle side who battled for every ball and worked hard till the final-whistle
On 16 minutes Imogen Fisher fired home for Sutton following a run down the right flank and a shot across the keeper
On 42 minutes following a Sarah Lampitt corner, a Knowle defender put through her own net
The second-half saw more Sutton pressure and on 57 minutes skipper Ruth Graham fired home following good work down the middle
The final goal on 81 minutes saw Corinna Williams clear the defence and shoot low into into the right-hand corner
There were notable performances from Imogen Fisher and Sarah Lampitt who were both outstanding and to the Pickford Solicitors player-of-the-match, Chantai Ahmed for her tireless work in midfield
Manager Andy Burman said "Knowle were an absolute credit to themselves with great spirit and attitude. We missed many opportunities but with players out injured and more on the treatment table, we did well and look forward to the Semi-Finals"