umm they can be 4.0 - 6.0 feet IMPROVED ANSWER: Tennis players vary in height. Tennis players are usually tall, especially the men. The average height for a women is around 5'9 and for men around 5'11. However the men reach outstanding heights, eg/ Ivo Karlovic from Croatia is 196cm tall the tallest male tennis player. Also, rising star Bernard Tomic of Australia who has a Croatian background (Y) is only 17 and is 194cm tall. If you'd like to find out the height of some tennis players just go on www.wikipedia.com/ and type in the tennis player you are interested in. Thanks, i hope this is a better answer.
NHL player John-Michael Liles is 5'-10''.
John Wall, is tall enough ok leave him alone
NBA player C.J. McCollum is 6'-04''.
NBA player Ersan Ilyasova is 6'-10''.
Jonathan McEnroe is 6'.
According to the ATP World Tour website (refer to the link, below), John Lloyd is 5'10'' (177 cm).
Mr. John was 5'8 3/4 in. tall about when I shook his hand & met him the first time he had tennis shoes on. Cordially, Barney
Andy Murray, the Number 1 ranked British tennis player, is 6'3" tall (1.90 meters).
NBA player John Henson is 6'-11''.
NBA player John Jenkins is 6'-04''.
NBA player John Salmons is 6'-06''.
MLB player John Axford is 6'-05''.
MLB player John Baker is 6'-01''.
MLB player John Buck is 6'-02''.
MLB player John Danks is 6'-01''.