Unforgotten reeled in Hiyaam at the 100m before forging clear, leaving the outsider Miss Admiration to fill the minor placing.
And Waller's grand stayer Who Shot Thebarman finally had his day in the sun with a last- stride win in the $2 million Sydney Cup at his fifth attempt to complete a Waller treble.
Who Shot Thebarman finished strongly on the outside to beat Zacada by a nose in the time-honoured 3200m handicap at Randwick.
Who Shot Thebarman had twice finished second in the Sydney Cup, including last year in the rescheduled race.
Along with his Sydney Cup placings, the former New Zealand stayer, and 2014 Auckland Cup winner, has also finished third in one of his three Melbourne Cup appearances and fifth in another.
Dean Holland saved ground on New Zealand stayer Zacada and raced through on the fence to hit the front at the 200m but Who Shot Thebarman got the bob of the head on the line.
Sir Charles Road was another length away third.