 Complete the following phrase:  Leius was the boys singles champion at the 1959 Wimbledon Championships. He won the Soviet Championships in 1963, 1964, 1965 and 1968. Other good performances during his career include reaching the final of the 1964 Queens Club Championships, which he lost to Roy Emerson, and taking Rod Laver to five sets at the 1969 Heineken Open. He was a gold medalist in the mixed doubles at the 