Announcing the shortlist at a press conference in London, the chair of this year's judging panel, Kwame Anthony Appiah, said: 'All of our six finalists are miracles of stylistic invention.
The shortlist for publishing's most prestigious prize includes British author Daisy Johnson, 27, the youngest author to make the final six for the prestigious award. "Also, some writers just won't listen".
A tale of slavery and history told through a fable-like lens, Edugyan's Washington Black has been described as a "ravishing" and sweeping novel which takes in everything from the plantations to Moroccan deserts.
"Washington Black", the saga of an escaped slave, marks the second nomination for Edugyan in recent days after being named to the long list for this year's Scotiabank Giller Prize. The judges would not comment on whether Robertson had fallen down in his editing duties towards Ondaatje. Her novel, Everything Under, is a story about a troubled mother-daughter relationship.
The Man Booker Prize was founded in 1969, and has become one of the most prestigious literary awards for an English-language author.
Daisy Johnson is on the list for her novel, "Everything Under".
The judges lamented the lack of entries from the Commonwealth and the Indian subcontinent.
Born in 1990, Johnson is not the first 27-year old to make the final Booker line-up, although she is the youngest: in 2013, New Zealander Eleanor Catton became the youngest ever shortlisted writer when she was 27, going on to win the prize at the age of 28 for her novel The Luminaries.
That shortlisted book is The Overstory by Richard Powers, a 500-word "eco-epic" about the wonder of trees, taking in everything from faith, love, photography, game code and the culture of ancient China.
Anna Burns' Milkman draws on the experience of Northern Ireland during the Troubles.
Kushner's The Mars Room was labelled a "heartbreaking exploration of lives at the margins of society", by Appiah.
The 2018 victor will be announced on October 16 at London's Guildhall at a gala dinner that brings together the shortlisted authors and well-known figures from the cultural world.