Static HttpClient thread safe?

My ASP.NET MVC project reads from and writes to DB through a Web API. Based on my research I plan to build a static utility class to avoid HttpClient to be frequently instantiated/disposed and sockets running out. In a simplified form:

public static class WebApiCalls
{
    private static HttpClient _client;

    static WebApiCalls()
    {
        //initializing _client

    }

    public static Ticket GetTicket(int ticketId)
    {
        var response = _client.GetAsync("<route to web api GetTicket>/" + ticketId).Result;

        //checking response code...

        return JsonConvert.DeserializeObject<Ticket>(response.Content.ReadAsStringAsync().Result);
    }

    public static string SaveTicket(Ticket ticket)
    {
        var content = new StringContent(JsonConvert.SerializeObject(ticket), Encoding.UTF8, "application/json");

        var response = _client.PostAsync("<route to web api SaveTicket>", content).Result;

        //checking response code...

       return response.Content.ReadAsStringAsync().Result; //ticketId
    }
}

Is this implementation thread safe? Could responses get mixed up when two requests from ASP.NET MVC to GetTicket at the same time? I'm still trying to get a hang of topics about static methods, thread safe and lock, etc.

Thank you!