Grand Hotel Panhans Championships in Semmering where he was beaten in three straight sets. In October 1930 he celebrated a triple crown feat at the Welsh Covered Courts Championhships in Llandudno where he clinched the singles, doubles and mixed doubles titles. In November he won the Lowland Championships of England in Peebles. He endorsed the doubles final partnering Francis Fisher. He missed the whole 1931 season because of an illness. In early 1932 he suffered from pneumonia. In mid-June he made his comeback as a runner-up for the Queen's Club Championships having it lost to Jack Crawford in four sets. In Liverpool at the Northern tournament he clinched the title by defeating home-favorite Nigel Sharpe. The same year he played his first Dutch international final against von Kehrling but came short. The following year he went for the title again but was stopped the second time by Giorgio de Stefani in a four set final. Timmer found consolation in the doubles contest where he and Kehrling took revenge by defeating de Stefani and George Lyttleton-Rogers and gaining the title. The key of the winning form was that Timmer overcame his well-known weak serve. Also in 1933 he participated in the West of England Championships only losing to Daniel Prenn in the final. In the 1934 Dutch International Championships Timmer was eliminated early in the semifinal by Hermann Artens. He was also unsuccessful in retaining the doubles title with Kehrling as the Austrian duo of Artens and Georg von Metaxa won that title as well. He had to skip the 1937 season as a result of rheumatism in his shoulder. He fought one of his last matches in 1938 against Kenneth Gandar-Dower, a victory of only two sets. Playing style His main weapon was his pure and hard backhand. His only weakness was his service, a shot that lacked strength and character. In 1934 Harry Hopman named him "one of the best hardcourt players of the world". Bill Tilden praised his stroke technique and described him as an all-court player, who adapted a "French" tennis style. Timmer considered himself a baseline player. He was coached by former Davis Cup player Gerard Scheurleer. He practised three times a week with Davis Cup partner Christiaan van Lennep. Other sports achievements In 1941 he won the national squash championships. In speed skating he completed the Elfstedentocht three times. In golf he won the De