There is a link inside the reply:
https://api.chess.com/pub/tournament/iacf-rapid-swiss-1114665/4
There all 52 players are listed.
UPD:
Also, here:
https://api.chess.com/pub/tournament/iacf-rapid-swiss-1114665/4/1
All players as well as games are listed.
Today we played a tournament and I tried to retrieve the information via API: https://api.chess.com/pub/tournament/iacf-rapid-swiss-1114665/. Registered user count = 52, but the endpoint returns only the first page of users (the first 25 users). Is it a bug or there is a way to retrieve the next pages?