George VI Coronation Plate at Wembley in May beating Tilden in the final, the French Pro championships in June (over Tilden and Henri Cochet), the Southport Dunlop Cup in July over Ramillon in the final and the Grand Palais Pro in August winning the concluding round robin against Tilden, Ramillon and Stoefen. He also won the Dutch Pro in Scheveningen in September beating Tilden in the final. In October he won the Wembley Pro (over Tilden) "there was too little variety, neither man favouring the volley much. However, one had to marvel at the superb length kept by Nusslein". The same month he won in Rome over Henri Cochet. 1938 Nüsslein won a round robin in Brussels in June over Tilden, Ramillon and Plaa. Another significant professional tournament of the time was the International Pro Championship of Britain in Southport, which Nüsslein won for the third time in a row in July, beating Tilden among others and won the German Pro in September. The same month, he won the French Pro in 1938 (over Tilden). In October he won another round robin in Brussels, this time over Tilden, Ramillon and Vincent Richards and beat the same players in a round robin in Copenhagen. 1939 Nüsslein won an eight-man round robin at Olympia in London in April. He won the event at Southport for the fourth year in a row beating Vines and Tilden in successive rounds. 1940-1957 In World War II Nüsslein served in the German army. Towards the end of the war, he suffered an arm injury which affected his tennis. At the 1953 Wembley Pro Championships, age 43, he won eight games against a 25-year-old Pancho Gonzales, losing 4–6, 4–6. In 1950, he won the international tennis coaches championships at Bad Ems. He continued to play tournaments until 1957 and gave tennis lessons until an age of 70. His most prominent tennis pupils included Wilhelm Bungert, Christian Kuhnke, Dieter Ecklebe and Wolfgang Stuck. Later years Nüsslein was known for his fine groundstrokes. Tennis historian Robert Geist described his playing style: "He possessed classic strokes, equal to Hall of Famers René Lacoste, Henri Cochet, and Karel Koželuh, as well as excellent volleys, magnificent drop shots and breath-taking half-volleys. As consistent as Ken Rosewall, Nüsslein was one of the best players during the 1930s." Remaining unmarried for most of his life, at age 72, Nüsslein finally married his long-time partner