Defending champion Alcaraz, 20, won his second major at the All England Club in July and said it would be "great" to play three-time U.S. Open winner Djokovic in the showpiece.
"It would be great to play a final against Novak here in New York but we both have really tough semi-finals," Alcaraz said.
"Last year I was facing my first semi-final of a Grand Slam.
In-form Djokovic, 36, will replace Alcaraz as world number one after the tournament and is on the hunt for his 24th Grand Slam title to match Margaret Court's all-time singles record.
Now in his first Grand Slam semi-final in only his fifth appearance at majors, Shelton is up for the daunting challenge of squaring off against Djokovic.
Persons:
Serbia's Novak Djokovic, Taylor Fritz, Brendan Mcdermid, Carlos Alcaraz, Novak, Alcaraz, Djokovic, Daniil Medvedev, Medvedev, Daniil I, Daniil, Andrey Rublev, Carlos, Margaret Court's, Ben Shelton, Michael Chang, Ben, That's, Shelton, who's, I'm, Hritika Sharma, Christian Radnedge
Organizations:
Tennis, U.S, REUTERS, Wimbledon, All England Club, Wells, Alcaraz, Djokovic, Thomson
Locations:
Flushing Meadows , New York, United States, New York, Flushing Meadows, American, Hyderabad