John Patrick McEnroe Jr. (born February 16, 1959) is a retired American tennis player, often considered among the greatest in the history of the sport.
 He was known for his shot-making artistry and volleying skills, as well as his confrontational on-court behavior that frequently landed him in trouble with umpires and tennis authorities.
John McEnroe and Patrick McEnroe were the defending champions.
 John McEnroe did not participate this year.
 Patrick McEnroe partnered Richey Reneberg, losing in the second round.
John McEnroe and Patrick McEnroe were the defending champions, but Patrick McEnroe did not participate.
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Lindsay Ann Davenport Leach (born June 8, 1976) is an American former professional tennis player.
 She was ranked World No. 1 on eight different occasions, for a total of 98 weeks.
 Davenport is one of five women who have been the year-end World No. 1 at least four times (1998, 2001, 2004, and 2005) since 1975; the others are Chris Evert, Steffi Graf, Martina Navratilova and Serena Williams.
 She has achieved the No. 1 ranking in doubles as well.
John McEnroe and Mark Woodforde were the defending champions but only Woodforde competed that year with Patrick McEnroe.
Guy Forget and Henri Leconte were the defending champions but lost the final to John McEnroe and Patrick McEnroe, 7–6, 6–3.
John McEnroe and Patrick McEnroe were the defending champions, but were eliminated in the round-robin stage.
The 1999 Porsche Tennis Grand Prix – Doubles was the tennis doubles event at the 1999 Porsche Tennis Grand Prix, the twenty-second edition of the most prestigious tournament in Baden-Württemberg.
 Lindsay Davenport and Natasha Zvereva were the defending champions, but they did not compete this year.
 Davenport competed with Martina Hingis as the first seed, while Zvereva competed with Elena Tatarkova.
 Davenport and Hingis withdrew in the quarterfinals due to Davenport having a wrist injury, whilst Tatarkova and Zvereva were knocked out in the first round.
Lindsay Davenport and Natasha Zvereva were the defending champions, but Davenport did not compete this year.
 Zvereva teamed up with Katarina Srebotnik and lost in quarterfinals to Lisa Raymond and Rennae Stubbs.
Patrick John McEnroe (born July 1, 1966) is a former professional tennis player and the former captain of the United States Davis Cup team.

Question: Patrick McEnroe and Lindsay Davenport, are both professional American sportsmen, for which sport?
Answer: tennis