The unseeded Indian, ranked 297, recorded a 6—3 6—3 win in one hour and 20 minutes over the world number 185 in the summit clash of the USD 35,000 hard court event.
The victory is expected to push Yuki into the top—220 in the ranking, which will make him the highest—ranked Indian in the ATP charts.
Yuki earned 80 ranking points and USD 5000 as prize money for his effort.
Last week, the 19—year—old had won his career's first ATP Challengers doubles title along with compatriot Divij Sharan in the Busan event.
Amir tired to claw his way back in the match when he broke Yuki in the third game to lead 2—1, but the Indian teen broke back immediately to level the scores.
He then broke the Israeli in the eighth game and served out the set and match in the next game.