The Lenglen–Mallory match at the 1921 U.S. National Championships was a second-round match between French tennis player Suzanne Lenglen and American tennis player Molla Mallory at the 1921 U.S. National Championships, an amateur tournament that has since become one of the four modern professional Grand Slam tournaments.

Lenglen had entered the match on a 108-match win streak, including one victory over Mallory, a five-time U.S. National champion in singles.

During this win streak, she defeated Mallory two more times to establish herself as the better player as viewed by the media and tennis historians.

The American media did not accept that Lenglen was in bad health either, accusing her of making an excuse for losing and coining the phrase "cough and quit" to describe her attitude.

Another more minor controversy was the United States Lawn Tennis Association (USLTA) not providing her with alcohol during the match, which they had promised in spite of Prohibition.

Molla Mallory was considered the best American women's tennis player, having won the U.S. National Championships in five of the previous six years.

During this trip, Lenglen defeated Mallory in their only meeting at the 1921 World Hard Court Championships in France.

As another stipulation, Lenglen agreed to the trip in part because the USLTA had promised to provide her with alcohol in spite of prohibition laws in the United States at the time.

Journalists at the time reported that Goss likely defaulted on purpose so that Lenglen would have to face Mallory without having played a competitive match since Wimbledon six weeks earlier.

They coined a phrase "cough and quit" that became popular at the time for describing someone who needed an excuse to avoid losing.

Lenglen had her first rematch with Mallory at the 1922 Wimbledon final, which she won with ease, only losing five games as a consequence of playing more aggressively.