As of December 2019, you can view DraftKings Showdown contests in the NFL Contest Dashboard. This popular mode for one-game slates is unique given its small player pool and high likelihood of duplicate lineups.
The first screen you'll see when opening the Contest Dashboard is the 'Exposures' tab. Here, you can see your (or other players') exposures compared to the field. Check off a user's name to see their ownership levels and leverage vs. the rest of the field in that tournament.
You can check off up to ten usernames to compare against one another as well. Green boxes indicate the user has more ownership of that player than the field, while red boxes indicate they have less.
Once contests begin, you can find out whether or not your lineups have any duplicates. For the DK Showdown mode, duplicate lineups are very common given the small player pool. They are also very important to know about, as it's impossible to win the top prize in its entirety if someone else made the same lineup as you.
To see the most heavily-used lineups, click the 'Duplicate Lineups' tab on the right side of the page.
This tournament featured one lineup that was made over 600 times, which is something users should do their best to avoid.
To see if you have any duplicates, search for your username on the right side of the exposures page. Once you have your name checked, click on the orange 'View Lineups' box on the far right side of the page.
This particular user made nine lineups, none of which were duplicate-free. The least-duplicated lineup had nine duplicates, which means he would have split the $200K first prize with nine other people if that lineup had won, resulting in a $20K win. One lineup had a whopping 570 duplicates, which was the 2nd-most often used lineup in this tournament. This means that the $200K first prize would have been split 571 ways if it had won, resulting in just $350.26 per person.
You can also view lineups from anyone else in the contest, including tops pros such as Awesemo, to see their strategies. In the example below, we can see that he made 150 lineups (max entries) for the Colts-Saints $10 DK Showdown tournament. Of his 150 lineups, four had zero duplicates. His lineups ranged from $45,900 salary used to $50,000. You can also break down how often different positions were used in the captain spot, what types of stacks were used and other interesting trends you may come across.
If studying up on past winners' lineups intrigues you, the leaderboard will be a very helpful page.
The left side of the page will breakdown exposure levels for the top 100 lineups in the contest you've selected, which you can change in the contest dropdown in the top left corner of the page.
The main portion of the page lists the top 100 lineups, as well as the salary used, ownership info and total points. To view a player's lineup in list form, hover your mouse over the three blue bars. A box will appear as it does in the example above showing every player's salary, ownership and points.