After Scorpions opted to bat, Patterson lost her partner Emma de Broughe early with the score reading 24. But the right-hander put on 66 runs for the second wicket with Josie Doolie.
Patterson, who earlier scored a match-winning 108 against ACT Meteors, started of with a boundary through extra-cover off Taneale Peschel in the third over and played a few shots off Sheldyn Cooper and Alana King. Once Nicole Bolton removed Doolie for 37, she added another 93 runs with Courtney Webb.
Webb scored her third half-century of the season as she contributed 51 off 53 before she became Peschel’s first victim. Despite losing another wicket in Jemma Barsby, Patterson continued batting patiently and got to her century from 135 balls in the 45th over with a single to third man off Piepa Cleary.
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Even though Scorpions lost three wickets including that of Patterson, 15 runs from the last over saw them finishing at the score of 251 for 7 from their fifty overs.
For Western Australia, Bolton was the most successful bowler with three wickets to her name.
In reply, Chloe Piparo started with three boundaries but was dismissed for 16 off 18 by Brooke Harris. Soon Western Australia were reduced to 28 for 2 when Samantha Betts removed Ashley Day for four.
From there, the Perth side kept losing wickets at regular intervals and were reeling at 127 for 7 in 29.4 overs with Eliza Doddridge dismissing Bolton and Mathilda Carmichael and the spinners Alex Price and Amanda-Jade Wellington removing Cleary and Alana.
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Amy Edgar and Peschel added 46 runs before Harris came back to finish the innings with Western Australia skittling out for 181 from 40.4 overs. For Scorpions, Harris finished with figures of 3 for 41, while Doddridge took two wickets.
Brief Scores: South Australian Scorpions 251/7 in 50 overs (Bridget Patterson 103, Courtney Webb 51; Nicole Bolton 3/33) beat Western Australia 181/10 in 40.4 overs (Amy Edgar 49, Nicole Bolton 36; Brooke Harris 3/41, Eliza Doddridge 2/24) by 70 runs