Question: Who is younger, Tom Okker or Martin Damm?

Context paragraphs:
1975 Stockholm Open – Men's Doubles: Tom Okker and Marty Riessen were the defending champions, but Riessen did not participate this year.  Okker partnered Arthur Ashe, losing in the quarterfinals.

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.

1980 U.S. Pro Indoor – Doubles: Wojtek Fibak and Tom Okker were the defending champions, but Okker did not participate this year.  Fibak partnered Heinz Günthardt, losing in the semifinals.

Martin Damm: Martin Damm (born 1 August 1972) is a former a professional tennis player from the Czech Republic.  He is best known as a doubles player (his highest ranking being No. 5 in the world in April 2007).  His highest singles ranking was No. 42 in August 1997.  Damm won a total of 40 titles in doubles, including one Grand Slam title.  He reached 5 singles finals.

2006 Dubai Tennis Championships – Men's Doubles: Martin Damm and Radek Štěpánek were the defending champions.  Damm partnered with Leander Paes, losing in the semifinals.  Štěpánek partnered with Tomáš Berdych, losing in the quarterfinals.

1999 du Maurier Open – Men's Doubles: Martin Damm and Jim Grabb were the defending champions, but competed this year with different partners.  Damm teamed up with Max Mirnyi and lost in second round to Ellis Ferreira and Rick Leach, while Grabb teamed up with Goran Ivanišević and lost in quarterfinals also against Ferreira-Leach.

2005 Qatar Open – Doubles: Martin Damm and Cyril Suk were the defending champions.  Damm partnered with Jared Palmer, losing in the first round.  Suk partnered with Pavel Vízner, losing in the quarterfinals.

2007 Open 13 – Doubles: Martin Damm and Radek Štěpánek were the defending champions.  Damm did not participate this year.  Štěpánek partnered with Mahesh Bhupathi, but withdrew from the first round.

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.

2002 CA-TennisTrophy – Doubles: Martin Damm and Radek Štěpánek were the defending champions but they competed with different partners that year, Damm with Cyril Suk and Štěpánek with Jiří Novák.

Supporting paragraphs: Tom Okker Martin Damm
Answer: Martin Damm