A well-timed ride by Roper resulted in the 21-year-old clinching victory on board Desiah for trainer Ciaron Maher, with Zac Lloyd (Hanau) and Dylan Gibbons (Infancy) rounding out the placings.
Roper (34 points) now boasts an eight-point lead in the Series, ahead of Olivia Chambers (26), Amy Lucas (23) and Zac Wadick (22).
Only two heats remain in the Series with Roper declaring she will be contesting both rounds at Dubbo (February 5) and Taree (February 11).
Check out the Rising Star Series page for the latest point score, honour roll, conditions etc.