Which tennis player, Tatiana Golovin and John Newcombe, boasts a highest singles ranking of 12?
Tatiana Golovin: Tatiana Golovin (Russian: Татья́на Григорьевна Голови́на , "Tatyana Grigoryevna Golovina" ; born 25 January 1988) is a Russian-born French retired professional tennis player. Tatiana Golovin:  Her highest singles ranking to date is 12. John Newcombe: John David Newcombe, AO, OBE (born 23 May 1944) is a former tennis player from Australia who is one of the few men to have attained a world No. 1 ranking in both singles and doubles.
Tatiana Golovin