Sussex came out after the break with a bit more urgency and managed to pull a goal back two minutes into the second-half.
Lizzie Rose in the Middlesex goal came charging out, brought down Lewry who was in a goal scoring positon and the referee immediately pointed to the spot. The number ten made no mistake in converting her penalty as she nestled the ball out of reach into the top left corner.
Ten minutes passed and Middlesex restored their two goal cushion after Cheatley skilfully tricked Rowe, chopped inside and steered the ball round Graves giving her no hope in between the sticks.
As the clock was ticking down, Sussex tried to find a route back into the final and Lewry was presented with two more opportunities. She found herself in plenty of space and tried her luck from twenty-yards out which looked to be drifting in but Rose pulled off a super save to tip it over the bar.
Lewry then wriggled through the opponents back line and drilled one towards the target which unfortunately flashed the wrong side of the crossbar.
With under ten minutes remaining Sussex didn’t give up, Tegan Ashley delivered a pin-point cross into the box for Amy Wollard, who chested it down nicely but could not make it count as she blasted her effort just over which seemed to sum up her sides night.
The last chance of the match came after Sussex gave away a cheap free-kick - Alissa Down whizzed a deep free-kick into the danger area which was pushed away by Featong Wilde, but her clearance fell to the feet of Anya Kinnane who stabbed home to seal the convincing victory.
Although Sussex topped the Southern Counties Cup Competition South group with a 100% record, it was their opponents Middlesex who finished their chances and made it count on the night resulting in being crowned as the 2018/19 Southern Counties Cup Competition champions.
After the game, Sussex manager Karl Davy said: “To be honest I am quite proud of the girls and I am sure the county is proud of the ladies we have brought in here - they’ve done really well.
“Our ladies put in a good second-half performance, they gave the ball away and nerves snuck into us in the first-half, we gave the ball away way too easy in the first twenty/twenty-five minutes and I think that’s where they hit us and that’s where the first two goals came from - our mistakes.”
(A selection of photographs can be found on Facebook - courtesy of Chris Benn)
Goals: 4-1; Shots: 21-15; Shots-on-target: 11-9; Corners: 7-1; Offsides: 2-2; Fouls: 11-12; Yellow cards: 0-0; Red cards: 0-0.
Middlesex: Rose, Slater, Lopes, Laidler, Keightley, Kinnane, Petit ©, Kummaning, Sampson, Barreca, Cheatley.
Subs: Deluca, Horsnell, Dyzadyk, Down, Neufville.
Sussex: Graves, Burke, Ward ©, Rowe, Younger, Taylor, Ashley, Amerena, Tubby, Lewry, Bacon.
Subs: Measures, Wilde, Wollard, Wingsutton, Phelps.
Match report by Natalie Clarke