paul's right
Worlds starts with a open doubles/singles qualifier ,you sign up and play in that first (the top 32 best teams are already seeded and put in a bracket on thier own) the last qualified 32 teams that survive the qualifier round will join them for the 64 team final phase round of Open doubles/singles
so if you play and qualify, no matter if you lose one match or not in the qualifiers ,then you go into the final 64 team round and start fresh ,so you get to lose twice again since its a brand new bracket
hope this helps,
-ben