in the seinfeld episode, kramer becomes a ballboy at the us open. what famous tennis player does he hurt?

It's Monica Seles - a former No. 1-ranked women's tennis player with nine Grand Slam titles.

The great ballman experiment ends with Kramer injuring Monica Seles in The Lip Reader - the 70th episode of the sitcom "Seinfeld".

See Yahoo Sports' top five tennis moments on 'Seinfeld'.

Episode Summary (from stanthecaddy.com):

Jerry is smitten with a line judge at the US Open, but after he gets her attention, he finds out she is deaf. Elaine has a problem not communicating with a limo driver. George wants to use Jerry's girlfriend to read the lips of his ex-girlfriend to find out what she is saying about him. While she is reading the lips, Kramer does the translation, that gets George in more trouble. Kramer becomes a ball man at the Open, when Monica Seles returns to tennis.

Watch Seinfeld episodes, get episode information, recaps and more at TV.com.

Tag: kramer 
Friday, July 14 2017
Source: https://sports.yahoo.com/blogs/tennis-busted-racquet/top-five-tennis-moments-seinfeld--tennis.html