WP:DIACRITICS: "follow the general usage in reliable sources that are written in the English language"
WP:UE: "The choice between anglicized and local spellings should follow English-language usage";
WP:EN: "The title of an article should generally use the version of the name of the subject which is most common in the English language, as you would find it in reliable sources (for example other encyclopedias and reference works, scholarly journals and major news sources).
MOS:FOREIGN: "adopt the spellings most commonly used in English-language references for the article"
Might be nothing but keep an eye open for this editor. Appears to have an agenda. Zerilous. Brand new editor with advanced wikipedia knowledge, but using it only on Rod Laver. Note - assured by administrator Doug Weller, that all is well here and that I jumped to a conclusion.