Hendrik ("Henk") Timmer was a Dutch sportsman, who primarily played tennis. Born in Utrecht, Timmer also won golf tournaments, became Dutch squash champion, played badminton and hockey. He died aged 94 in Bilthoven, four days before his former doubles partner Kea Bouman. Apart from being a Dutch tennis champion, he was Swiss, Welsh and Scottish indoors champion as well.

Cornelia "Kea" Tiedemann-Bouman was a female tennis player from the Netherlands. She won the singles title at the 1927 French Championships, beating Irene Bowder Peacock of South Africa in the final. Bouman was the first and, to this date, the only Dutch woman who has won a Grand Slam singles title.