Yuki stunned second seeded Damir Dzumhur of Bosnia and Herzegovina 6-3, 4-6, 6-2 in the boys' singles semi-final at the Kallang Tennis Centre on the fifth day of the Games to assure India of another silver.
In the summit clash, the sixth-seeded Indian will take on Juan Sebastian Gomez of Colombia who beat Victor Baluda of Russia 6-1, 3-6, 7-5 in the other semi-final.
Yuki had on Wednesday braved cramps to get the better of Ireland's John Morrissey in the quarter-finals.
The wrestlers had won two medals for India. Pooja Dhanda had bagged a silver in women's 60kg freestyle while Kadian Satyawart fetched a bronze in men's 100kg freestyle.
Shuttler H S Prannoy is also assured of at least a silver after stunning top seed Kang Ji Wook of Korea in the singles semi-final.
He, however, will have to wait longer in his quest for a gold medal as his final match against Pisit Poodchalat of Thailand has been rescheduled.
The other Indian who impressed on Thursday was Durgesh Kumar who won the boys 400m race heat number two with an effort of 52.20sec to qualify for the final round.
In basketball, Indian boys lost to New Zealand 12-17 in a Group A preliminary round match.
In swimming, Aaron Agnel D'souza finished fifth in boys 100m freestyle second semi-final with a timing of 51.49sec. He had qualified for the semi-finals after finishing fourth in the heat number five.
In the women's 100m butterfly, Arhatha Magavi finished a disappointing eighth in heat number four.
India fielded 32 competitors in the inaugural edition of the Games which is meant for athletes in the age group of 14 to 18.
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