In this paper, the properties of the operator W_(s,b)f(z) involving Hurwitz-Lerch Zeta meromorphic function are investigated. By using the definition of third-order differential subordination and differential superordination, and choosing suitable admissible functions, we derive some results with third-order differential subordination and differential superordination associated with the operator W_(s,b)f(z). Furthermore, the Sandwich-type results are also considered, which extends the related work of second...