The Amazing Race: Unfinished Business

 is the eighteenth installment of The Amazing Race. It was confirmed on Nov. 5th, 2010 and is the first US season of The Amazing Race broadcast in High-Definition Format.

This is an All-Star season comprising two teams from Season 12, five teams from Season 14, two teams from Season 15, one team from Season 16 and one team from Season 17.

Teams

 * Main article: The Amazing Race 18 Teams

Results
The following teams participated in the Race, with their relationships at the time of filming. Placements are listed in finishing order:
 * All contestants have appeared on one previous season.

Amanda and Kris received a U-Turn for finishing last in the Starting Line Task By the end of Episode 1, Jet & Cord had not reached Phil at the "pitstop." Flight Time & Big Easy were initially checked in 3rd; however, they were retroactively issued a 30-minute penalty for moving Ron & Christina's personal belongings at the Detour. Ron & Christina were moved up to 3rd, while Kisha & Jen checked in 4th, and Jet & Cord were checked in 6th, leaving Flight Time & Big Easy in 5th place. By the end of Episode 4, neither Zev & Justin nor Kent & Vyxsin had checked in at the mat. Gary & Mallory used the Express Pass to skip the Leg 5 Roadblock. Although Kisha & Jen were the 5th team to arrive, due to a 30-minute penalty assessed to Kent & Vyxsin, they were the 4th team to be checked in.

Route

 * Click here for this season's Route Map

Leg/Episode 1
Title: "Head Down and Hold On (Australia)" –- non-contestant
 * Starting Line: San Gorgonio Pass Wind Farm, Palm Springs, California
 * Teams had to search a field of paper airplanes to find one with "Qantas" written on it using the clue: "Queensland and Northern Territory Aerial Services", then return the airplane to Phil in exchange for their tickets to Sydney
 * The first 8 teams would be on the 1st flight, the rest on a 2nd flight, with the last team receiving an automatic U-Turn after completing this leg's Detour
 * Flight from Los Angeles International Airport, Los Angeles, California to Sydney (Kingsford Smith) Airport, Sydney, New South Wales, Australia
 * Circular Quay/Sidney Ferries to Manly Wharf, Manly
 * Oceanworld Manly
 * Who's ready to get tanked?: One team member must scuba dive and search for a compass hidden on the floor of a large shark tank, then use the compass to decipher a series of nautical flags which tell them the next location and catchphrase which they must tell the Commodore ("I am between the Devil and the deep blue sea")
 * Manly 16ft Skiff Sailing Club
 * Sail 16 Foot Skiff: Join a skiff crew and sail along a course to retrieve the next clue
 * Shelly Beach, Manly (Superleg midpoint)

Leg/Episode 2
Title: "I Never Looked So Foolish in My Whole Entire Life (Outback)" –-Kisha
 * Sydney Town Hall, Sydney
 * teams had to find a statue of an anchor outside Sydney Town Hall using the clue "To Sail to Stop"; there teams had to sign up to one of two charter flights
 * Sydney (Kingsford Smith) Airport, Sydney, New South Wales to Broken Hill Airport, Broken Hill, New South Wales
 * The Living Desert, Broken Hill
 * Spirit World: teams had use traditional materials to make a stone mosaic that matched a shown example, then they had to perform a dance upon the mosaic intended to raise ancestral spirits
 * Natural World: teams had to create Aboriginal territory markers by mixing a natural dye with water and use their mouths to spray the mixture onto a stencil to create four images
 * Central Football Club, Broken Hill
 * teams had to find the "Home of the Magpies"; while there, teams had to dress as kangaroos and find the corner of Mercury (Hg) and Bismuth (Bi) streets using a periodic table of elements with the symbols Hg and Bi highlighted
 * Junction Mine, Broken Hill

Leg/Episode 3
Title: "We Had a Lot of Evil Spirits Apparently (Japan)" --Christina
 * Broken Hill Station, Broken Hill to the Central Railway Station, Sydney via Indian Pacific
 * Sydney (Kingsford Smith) Airport, Sydney to Narita International Airport, Tokyo, Japan
 * Rotating Parking Garage, Shibuya, Tokyo
 * Yabusame Dojo, Kamakura, Kanagawa Prefecture
 * Who wants to go back 1000 years in time?: Team members must dress as samurai and learn the proper Yabusame Ritual and learn techniques for shooting a bow and arrow while seated on a revolving wooden horse.
 * Daiyūzan Station – Kintarō Statue, Minamiashigara
 * Prayer of Purity: teams take part in a Shinto cleansing ritual by donning traditional clothing, learning a prayer, and standing under a cascading waterfall of 45°F for one minute
 * Frog of Luck: teams strip down, enter a large mud pit and while being pelted with mud, search for a toy frog in the mud
 * Commodore Perry Monument, Kurihama, Yokosuka

Leg/Episode 4
Title: "This is the Most Stupid Day Ever (Lijiang, China)" --Vyxsin
 * Narita International Airport, Tokyo, Japan to Kunming Wujiaba International Airport, Kunming, Yunnan, China
 * Teams had to choose their own method of transportation to Lijiang
 * Kunming Railway Station to Lijiang Train Station
 * Kunming Wujiaba International Airport to Lijiang Airport
 * Jade Dragon Snow Mountain, Kunming
 * teams had to saddle a yak correctly and ride across a river
 * Spruce Meadow, Yúnshāpíng, Kunming
 * teams had to search for charms that depicted the twelve signs of Chinese zodiac, collect all twelve then attach them to a mobile in the correct order
 * Old Town of Lijiang
 * teams had to to verbalize their zodiac sign and place a written wish into a slot on a prayer wheel that matched the symbol they called out
 * Old Town of Lijiang
 * Hammer: teams went to a candy store and used mallets to pound liquid candy to the correct consistency, then cut and box the candy
 * Horn: teams had to take a large ceremonial horn and lead a group of dancers to Wencheng Palace
 * Eternal Tower on Lion Hill, Lijiang

Leg/Episode 5
Title: "Don't Ruin the Basketball Game (Kunming, China)" --Mallory
 * Lijiang Train Station, Lijiang to Kunming Railway Station, Kunming
 * Dounan Flower Market, Kunming
 * Golden Horse and Jade Cock Memorial Archway, Kunming
 * Honor the Past: teams must watch a traditional Tibetan performance and, without taking notes, place dolls representing the performers in the same order in which they appeared on stage.
 * Embrace the Future: teams must properly cary the parts of a solar water heating system to the the roof of a building and correctly install it
 * Chinese Minority Heritage Center, Kunming
 * Stone Forest, Shilin Yi Autonomous County
 * a team member had to a correctly put together a life-size model of a dinosaur; if the model was unsound, a paleontologist could order them to stop and redo the model
 * Green Lake Park, Kunming

Leg/Episode 6
Title: "I Feel Like a Monkey in a Circus Parade (Kolkata, India)" --tba

Pit Stop Greeters

 * Click here for this season's Greeters

Phil's Diary

 * This season Phil Keoghan is presenting behind-the-scenes episodes of Phil's Diary.

Memorable Moments

 * The teams who were expected to land in Australia first got delayed due to a medical emergency of a sick passenger.
 * In the second half of the first leg, every team had to dress up as kangaroos while searching for their next clue.

Franchise

 * First season to have an automatic U-Turn.
 * First season to have the first leg as a double-length leg.
 * No one is sent to the Elimination Station after the Episode 1.
 * First season to have Episode 1 end with a cliffhanger.
 * Most parent/child teams in a single season, 4.

American

 * Lowest number of couples in love, two.