Jonkheer Roelof van Lennep (Dutch pronunciation: [ˈrulɔfɑn ˈlɛnɛp]; 3 October 1876 – 13 September 1951) was a Dutch male tennis player. He competed for the Netherlands in the tennis event at the 1908 Summer Olympics where he took part in the men's singles and men's doubles competitions (partnering with his brother Christiaan).
Hendrik ("Henk") Timmer (Dutch pronunciation: [ˈɦɛn.drɪk ˈtɪmər.]; 8 February 1904 – 13 November 1998) 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.