Date of Birth: 
Place of Birth: Buenos Aires, Argentina
About Lucas Arnold Ker
- Lucas Arnold Ker (Spanish pronunciation: ['lukas a?'nol 'ke?]; born 12 October 1974) is a retired professional tennis player from Argentina. Arnold Ker started playing tennis in the Olivos Tenis Club of Buenos Aires, under coach Malcolm Campbell. He is right-handed and turned professional in 1994.
- He has played several times for the Argentine Davis Cup team, where he made his debut in 1997 against Venezuela.
- He was Roger Federer's opponent in the Swiss' first professional match in 1998, beating the 17-year-old future great in straight sets.
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