Michelle Ward, had a lob cleared by defender Natasha Moloney, but Russ then extended the Kent lead further with her second and her side’s third.
To their credit, despite the three-goal deficit, Sussex continued to press forward and almost threw themselves a lifeline when Maya Beasley headed against the crossbar from Nicole Baitup’s corner.
Kent were reduced to ten players on 65 minutes when Ellie Jeffkins was given her marching orders having lashed out at Graves. The defender connected with her opposite number with a punch - after Graves had won the ball in a tackle - and was sent from the field by referee Howard Collins.
Sussex keeper, Lauren Graves, saved well from substitute Mia Lockett and then tipped wide from a Danielle Farmer header on the rebound. Gray was powerless to prevent another substitute - Emily Jacobs - from completing the scoring late on despite a hint of offside.
(A selection of photographs are available on Facebook - courtesy of Simon Roe Photography)
Goals 4-0; Shots 15-8; Shots-on-Target 8-2; Fouls 6-2; Corners 9-5; Offsides 3-1; Yellow cards 0-0; Red Cards 1-0.
Kent: Kacary; Aston-Jones, Moloney, Jeffkins, Seely, Farmer, Rivers, Goad, Russ, Burrows, Adby.
Subs: Jacobs, Penfold, Lockett, Chapman.
Sussex: Graves, Beesley, Ward, M. Fox, S. Fox, Sutcliffe, Collier, Robson, Gray, Larkin, Baitup.
Match Report by Jamie Spoor