The last-minute emergency call of Martin Lee cost the defeat of Cyd Ho in a narrow margin to Democratic Alliance for the Betterment of Hong Kong's (DAB) Choy So-yuk.
Legislative Council President Rita Fan also contested in Hong Kong Island for the first time.
Six tickets took part in the election, with the DAB fielding a ticket of chairman Ma Lik and Choy So-yuk and the pro-democrats fielding three tickets, one consisted of Martin Lee, Yeung Sum and Joseph Lai of the Democratic Party, the second consisted of Audrey Eu and Cyd Ho, and the third included former Democratic Party member Tsang Kin-shing.
Should the Democratic Party drew around 1900 more votes from the Eu-Ho ticket, the third-rank candidate on their list would have defeated Choy.
When the results were announced in the morning of the following day, Martin Lee said before cameras "I'd rather lose with dignity than win like this", on the "unexpected" defeat of Cyd Ho.