In case you missed the Mambo Marathon on Monday's Dancing with the Stars, the remaining nine couples faced off against one another in a simultaneous competition on the dance floor. As you can see from the video, Michael Irvin and Anna Demidova were the first couple eliminated by the judges and Joanna Krupa and Derek Hough were the last. That boosted Krupa and Hough over the top to top of Monday's leaderboard.