Williams na onye otu ya bụ nwoke nọchitere mba Amerika, ebe Federer na onye otu ya bụ nwaanyị nọchitere Swizaland. 
Williams na onye otu ya bu nwoke nọchitere mba Amerika, ebe Federer na onye otu ya bụ nwaanyi nọchitere Swizaland. 