"It has been a decent year and I finished the year with another great competition and won a silver. I will hope to play one year from now with a similar certainty and would like to go further," Sindhu said after the match.
The 22-year-old verged on securing the title before completing sprinter up by and by in her third real competition, following a year ago's Rio Olympics and the current year's Glasgow World Championship.
In scenes like the World Championship last in Glasgow in August, the summit conflict here went last possible minute as the twosome occupied with a clash of wearing down and nerves.
"I was not contemplating the longest match but rather then after the match, it cleared out me with an awful inclination that it was much the same as the match against Okuhara," said Sindhu, who had completed as sprinter up at Hong Kong Open too in November.
"Yamaguchi's style was a greater amount of rally and I was set up for it. I knew it would be a long match."
Playing her fourth last of the season, Sindhu logged the primary point with a heavenly down the line crush. Be that as it may, two or three unforced blunders and a wrong judgment at the gauge enabled Yamaguchi to make it 3-2.
A fortunate net harmony gave another point to the Japanese. In any case, Sindhu released a magnificent cross court crush to draw equality at 5-5.
Sindhu again squeezed out a 8-6 lead with an arrival on her opponent's forehand. Yamaguchi excessively missed the line again as the Indian drove 9-7. A strike tap close to the net gave another point to Sindhu, who entered the interim with a three-point advantage after Yamaguchi sent another to the net.
After the difference in closes, Yamaguchi limited the deficiency to 10-11 preceding Sindhu snatched a point in the wake of being prodded by an energized India mentor Pullela Gopichand from the sidelines.
At 13-12, Sindhu missed the line again after another rally to permit Yamaguchi draw equality. What followed next was yet another immersing rally where the Indian returned two crushes previously abandoning her rival sprawling on the court.