World number four Saina, who has already qualified for the semifinals, beat Xin 21-17, 22-20 in a 39-minute match to top Group B. She will take on Tine Baun of Denmark in the semifinal tomorrow.

The Indian is now just one step away from becoming the first Indian singles player to reach the summit clash of the Super Series Finals.

Jwala Gutta and V Diju are the only other Indians to have achieved the feat when the mixed doubles pair reached the finals in the 2009 edition of the tournament before losing to Christinna Pedersen and Joaquim Nielsen.

Trailing 4-8 at one point in the first game, Saina reeled off seven straight points to go past Xin and wrest the lead at 16-12 and held her ground to pocket the game.

In the second game, Saina opened up a 9-2 lead and moved to 17-11 but the Chinese was not the one to give without a fight as she first caught up with the Indian at 19-19 and then registered one more point to lead 20-19.