json

Participant.cs

    public class Participant
    {
        public string id { get; set; }
        public string tournament_id { get; set; }
        public string name { get; set; }
        public string seed { get; set; }
        public bool active { get; set; }
        public string created_at { get; set; }
        public string updated_at { get; set; }
        public string invite_email { get; set; }
        public string final_rank { get; set; }
        public string misc { get; set; }
        public string icon { get; set; }
        public bool on_waiting_list { get; set; }
        public string invitation_id { get; set; }
        public string group_id { get; set; }
        public string checked_in_at { get; set; }
        public string challonge_username { get; set; }
        public string challonge_email_address_verified { get; set; }
        public bool removable { get; set; }
        public bool participatable_or_invitation_attached { get; set; }
        public bool confirm_remove { get; set; }
        public bool invitation_pending { get; set; }
        public string display_name_with_invitation_email_address { get; set; }
        public string email_hash { get; set; }
        public string username { get; set; }
        public string display_name { get; set; }
        public string attached_participatable_portrait_url { get; set; }
        public bool can_check_in { get; set; }
        public bool checked_in { get; set; }
        public bool reactivatable { get; set; }
    }

Player.cs

    public class Player
    {
        public Participant participant { get; set; }
    }

Program.cs

    class Program
    {
        static void Main(string[] args)
        {
            string my_text = "{\"participant\":{\"id\":36731929,\"tournament_id\":2305074,\"name\":\"Alexis2dGod\",\"seed\":1,\"active\":true,\"created_at\":\"2016-03-05T04:28:51.482-05:00\",\"updated_at\":\"2016-03-05T04:28:51.482-05:00\",\"invite_email\":null,\"final_rank\":7,\"misc\":null,\"icon\":null,\"on_waiting_list\":false,\"invitation_id\":null,\"group_id\":null,\"checked_in_at\":null,\"challonge_username\":null,\"challonge_email_address_verified\":null,\"removable\":false,\"participatable_or_invitation_attached\":false,\"confirm_remove\":true,\"invitation_pending\":false,\"display_name_with_invitation_email_address\":\"Alexis2dGod\",\"email_hash\":null,\"username\":null,\"display_name\":\"Alexis2dGod\",\"attached_participatable_portrait_url\":null,\"can_check_in\":false,\"checked_in\":false,\"reactivatable\":false}}";
            Player player = Newtonsoft.Json.JsonConvert.DeserializeObject<Player>(my_text);
        }
    }