Are Wojciech Fibak and Tom Okker both Polish tennis players?
Tom Okker Thomas Samuel Okker (born 22 February 1944) is a former Dutch tennis player. He was ranked among the world's top 10 singles players for seven consecutive years, 1968–74, reaching a career high of World No. 3 in 1969. He also was ranked World No. 1 in doubles in 1969.
Jan Hajer Jan Hajer (born 31 March 1942) is a Dutch former tennis player. He was national champion in 1963. He won the final by winning over Willem Maris, Dutch National Champion in 1962. In 1964 Jan Hajer lost the final of the Dutch National Championship against Tom Okker. Later Hajer and Okker represented the Netherlands in the Davis Cup team. Hajer had a relative short international tennis career and participated in Wimbledon three times. In 1967 he reached the second round which he lost in five sets to Jaidip Mukerjea. Hajer and Okker competed in doubles events in South Africa, Philippines and Australia.