21-year Yuki old had lost to Duckworth last week in the Melbourne Challenger but today he put up a much better show and sent the second seed packing with a comfortable 6-2 6-4 scoreline in the semi-finals.
277-ranked Yuki will now fight it out American top seed Bradley Klahn in the final of the USD 50000 hard court event.
Yuki, who won his first Challenger level title in Fergana, Uzbekistan last year, had lost to Bradley, ranked 123, in July this year in Binghamton.
Meanwhile, in the USD 75000 Charlottesville event in the United States, both Somdev Devvarman and Saketh Myneni crashed out after quarter-final defeats.
Second seed Somdev lost 6-7 (4) 4-6 to seventh seed American Rhyne Williams while Myneni's splendid run ended with a 4-6 0-6 defeat against Canadian Jesse Levine.