MacDonald-Gay’s 6-11 off her four overs were the best figures ever recorded in women’s domestic T20 cricket
The Surrey speedster was on a hat-trick three times, while Bethan Miles took 2-10 on her Blast debut. Bess Heath top scored for Durham with 28.
Durham fought magnificently to defend the total, Heather Graham taking 3-19 and Trudy Johnson 2-20, helped by some frenetic batting from the hosts, but Alice Monaghan (20 not out) kept her head to see Surrey home on 103-8.
Surrey are a point ahead of second-placed Blaze, with Somerset two points behind in third.
