Emma Raducanu, of Great Britain, reacts after defeating Janice Tjen, of Indonesia, during the second round of the U.S. Open tennis championships in New York.

Emma Raducanu, of Great Britain, reacts after scoring a point against Janice Tjen, of Indonesia, during the second round of the U.S. Open tennis championships in New York.

Janice Tjen, of Indonesia, returns a shot to Emma Raducanu, of Great Britain, during the second round of the U.S. Open tennis championships in New York.

Emma Raducanu, of Great Britain, returns a shot to Janice Tjen, of Indonesia, during the second round of the U.S. Open tennis championships in New York.

Janice Tjen, of Indonesia, returns a shot to Emma Raducanu, of Great Britain, during the second round of the U.S. Open tennis championships, in New York.

Emma Raducanu, of Great Britain, returns a shot to Janice Tjen, of Indonesia, during the second round of the U.S. Open tennis championships in New York.

Janice Tjen, of Indonesia, returns a shot to Emma Raducanu, of Great Britain, during the second round of the U.S. Open tennis championships in New York.

Emma Raducanu, of Great Britain, serves to Janice Tjen, of Indonesia, during the second round of the U.S. Open tennis championships in New York.

Emma Raducanu, of Great Britain, serves to Janice Tjen, of Indonesia, during the second round of the U.S. Open tennis championships in New York.