I have believed for a long time that some similar names are pronounced with an "s", such as:
troicky = troisky
wosniacky = wosniasky
maybe I have been wrong all this time. I would like to know some first-hand opinion.
I heard Jankovic pronounce Troicki as Troisky on a quiz thing at roland garros last year, so I will take her word for it seeing as she is the same nationality.