Four teams compete in ‘Dancing with the Stars' Semi-Finals to win the Mirror Ball trophy. Noah Galloway and Sharna Burgess, Nastia Liukin and Derek Hough, Riker Lynch and Allison Holker, and Rumer Willis and Valentin Chmerkovskiy are the four duos remaining in the competition. Season 20 Week 9's Semi-Finals airs on Monday, May 11. The Results Show airs on Tuesday, May 12 at 8|7c on ABC.

'DWTS' is a televised reality dance competition between different pairs of celebrities and professional dancers. The dance duos choreograph routines and perform in front of four judges and audiences. Each performance is graded on a scale of 40 points. Couples are eliminated each week. Four couples remain in the competition in Week 9’s Semi-Finals.

On Week 9, each team will dance two full routines. The routines must include selections from one unlearned dance and one from the judges’ choice. Noah Galloway and Sharna Burgess will dance the Viennese waltz. Nastia Liukin and Derek Hough will dance a quickstep routine. Riker Lynch and Allison Holker will dance a contemporary dance routine. Rumer Willis and Valentin Chmerkovskiy will dance the Argentine tango.

The choreographed routine will be judged and scored by a panel of four judges, Len Goodman, Bruno Tonioli, Carrie Ann Inaba, and Julianne Hough. Each judge is a renowned dancer who is entitled to grant one to ten points. A perfect score would be a straight ten across the judges’ panel, resulting in a total of 40 points. Tom Bergeron and Erin Andrews co-host the show. BBC Worldwide Productions is the producer of ‘DWTS.’

Week 8 "America's Choice" Recap of Eliminations:

On Week 8 “America’s Choice,” two dance duos were eliminated. Couples performed a routine to an unlearned dance and song that was chosen by the public, as well as a trio dance involving an eliminated pro or a member of the dance troupe. 

Chris and Witney were eliminated for scoring the least amount of points. They danced with former contestant Lindsay Arnold. The trio danced two routines. They danced a contemporary dance routine to “Lay Me Down” by Sam Smith and the paso doble to “Outside” by Calvin Harris featuring Ellie Goulding. The group received 34 points for the first routine and 30 points for the second one, resulting in 64 points.

Robert and Kym were eliminated after dancing with former contestant Jenna Johnson. They danced a contemporary dance routine to “Champagne Kisses” by Jessie Ware and “Cinema Italiano” by Kate Hudson. The trio received 33 points and 29 points, resulting in a total of 62 points for their overall performance.