The Indian star broke the 24-year-old Li, who is the top Asian player and ranked 21st in the world, in the first and fifth games of the first set.
Sania,20, had a smooth passage in the second set as well, breaking Li in the third and fifth games, to romp home in one hour and six minutes.
Sania, who is ranked 66th, will take on another Chinese Jie Zheng (33rd), who defeated Aiko Nakamura of Japan 6-3, 6-2 in the other semifinal, for the gold medal.
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