One of the interesting changes with the last UT4 release was the addition of Ranked Duels. If you completed the duel tutorial, “Ranked Duel” would get added to the menu as an option. For those of you wondering why there is a big empty space at the bottom of the current main menu, it is to display additional unlocks such as Ranked Duel.
Epic continues to work on their matchmaking code, but due to few issues that were uncovered, Ranked Duel has been temporarily shut down and removed from the menu. Here’s hoping it makes a return in the next release!