well imo iga"s serve is quite bad. she was broken too many times during us open, vickery was almost beating her by breaking every serve game of hers, so did vika as well. though she got sensational scores, iga got broken or won a lot of deuce games in this tournament as well. serve doesn"t matter much on clay but it is like e4 opening on other surfaces. opponents can easily check mate if she doesn"t have a proper serve and they will hit faster, harder and bigger since they will be playing against a slam champion in the future. so if she keeps not benefiting from her serve games, i can"t give any chance to iga on other surfaces- but she is the queen of clay! 2-3 rg slam possible!