Middlesex started powerfully erstwhile opener Artemis Downer, who deed an unbeaten 60 erstwhile they hammered Glamorgan by 10 wickets earlier successful September, impressed with a mates of boundaries earlier being caught astatine constituent disconnected Anna-Mae Shearn.
Izzy Routledge and Sproul helped dependable the vessel with a fluent 60-run partnership, earlier Routledge was caught astatine mid-off from a Nicole Reid delivery.
Sproul soon followed for a coagulated 43 from 67 balls erstwhile caught and bowled by Poppy Walker.
Poor Glamorgan fielding, with respective dropped catches and a missed stumping, boosted Middlesex arsenic Horley and Trussler enactment connected 131 earlier the second was stumped by Abbey Freeborn disconnected the bowling of Eve Jackson.
Horley's innings was ended connected 117 but she helped Middlesex acceptable a pugnacious people of 279.
They got their breakthrough successful the 5th implicit erstwhile influential skipper Lauren Parfitt was bowled by Siya Nanavati for eight.
Glamorgan's woes continued erstwhile the hard-hitting Daisy Jeanes was caught astatine mid-wicket disconnected Issy Routledge.
The wickets continued to tumble erstwhile Horley followed up her period by taking the wickets of Bethan Ellis and Megan Sturge arsenic Glamorgan slumped to 72-4.
A 72-run concern betwixt Freeborn and Gammon offered immoderate hope, until the erstwhile was bowled by Anaya Patel for 43.
Glamorgan won the League Two T20 Blast but Hannah Davis extinguished immoderate hopes of a treble with 2 swift wickets, including the cardinal 1 of Gammon erstwhile she was caught successful the heavy for 58.
It was fitting that Horley had the last accidental erstwhile she had Gemma Porter caught by Trussler.
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