The San Francisco 4.0/4.5 combined singles tennis ladder. Only challenge people within 4 positions of your current rank. Note that people can be tied, especially at the beginning, so 4 “positions” may include more than 4 individuals. If you receive an invalid challenge, please just politely let your challenger know their mistake. Ranks may change between challenging and actually playing / entering the score, so please submit your score here immediately following the match. Email firstname.lastname@example.org with any questions or for help with match ups.