Dancing With The Stars season 21 continues Oct. 5 on ABC as the 10 remaining pairs take part in Most Memorable Year night, an evening of routines inspired by the celebrities' most meaningful years of life. With the midway point of the season rapidly approaching, Bovada Sportsbook posted updated odds on Oct. 2, and the rankings include more than a few small surprises for show fans to digest.

DWTS week 4 odds

  • Backstreet Boy Nick Carter and Sharna Burgess: 2/1
  • Actress Alexa PenaVega and Mark Ballas: 9/4
  • Big Time Rush star Carlos PenaVega and Witney Carson: 7/1
  • Singer Tamar Braxton and Valentin Chmerkovskiy: 7/1
  • Train hero Alek Skarlatos and Lindsay Arnold: 7/1
  • Wildlife conservationist Bindi Irwin and Derek Hough: 8/1
  • Social media sensation Hayes Grier and Emma Slater: 12/1
  • Singer Andy Grammer and Allison Holker: 16/1
  • Actor Gary Busey and Anna Trebunskaya: 50/1
  • Celebrity chef Paula Deen and Louis Van Amstel: 100/1

Dancing with the Stars 2015 week 4 odds: the underrated couples

The biggest surprise in the mix is the inexplicably low rating for Bindi and Derek.

The 17-year old has owned the top spot on Dancing with the Stars judges Carrie Ann Inaba, Julianne Hough, and Bruno Tonioli's leaderboard two out of four possible times. Her enthusiasm is infectious, and she has multiple famous fans, including DWTS pro Kym Johnson and Shark Tank star Robert Herjavec, who told Examiner on Sept. 28 that he's rooting for the teen to take the season 21 title.

Also surprising are the comparatively low odds for two other couples: Alek and Lindsay, and Hayes and Emma. Julianne called Alek and Lindsay's Sept. 28 True Blood-inspired tango "perfection" and all three judges have been uniformly complimentary of Lindsay's teaching chops. Although Hayes' Ninja Turtles jive fell a bit flat, the 15-year old is a bona fide social media phenomenon, and it's unlikely that his fans will let him go home any time soon.

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The overrated couples 

Although married couple Alexa and Carlos are both excellent dancers, their odds are arguably inflated. Alexa and Mark's Breaking Bad jazz number represented a stroke of creative genius and the pair deserved a share of the top spot on the Sept. 28 leaderboard, but their mark of 36 points was significantly higher than the scores earned for their previous three dances. If they maintain consistency in the weeks to come, they'll be legitimate contenders, but it's just too soon to be sure the momentum will last. 

Carlos and Witney started off season 21 on a high note, but their most recent offerings haven't impressed the panelists. Carrie Ann even expressed disappointment over their week three Golden Girls-inspired jazz piece, and that's not something that a Mirrorball Trophy favorite should hear from a judge.

Dancing with the Stars season 21 resumes Oct. 5 on ABC. Tune in to see how it Most Memorable Year night pans out, and to find out if the oddsmakers' predictions transform into reality.