He represented Bolivia in Junior Davis Cup tennis competition at the South American level (once defeating Ricardo Ycaza in doubles), taught tennis at the Welby Van Horn Tennis Camp, and played on the tennis teams of DePaul University (under legendary coach George Lott) and Oxford University.
One of the high points of his career was a crushing defeat (6–0, 6–2, 6–1) of the great Bill Tilden at a match between U.S. and British Empire service teams at Wimbledon in July 1945, supposedly the worst drubbing of Tilden's career — Tilden, however, was 52 years old at the time while Van Horn was 25.
Ludwig van Beethoven | Vincent van Gogh | Van Morrison | Van Halen | Gus Van Sant | Anthony van Dyck | Ellen van Dijk | Cape Horn | Van Diemen's Land | Van | Martin Van Buren | Eddie Van Halen | Melvin Van Peebles | Jean-Claude Van Damme | Jan van Eyck | Armin van Buuren | Van Cliburn | Townes Van Zandt | Marcus Welby, M.D. | Van, Turkey | Dave Van Ronk | Van Dyke Parks | Van der Graaf Generator | The Dick Van Dyke Show | Lee Van Cleef | horn | Van Gogh | Trevor Horn | Han van Meegeren | Armin Van Buuren |