Chinese shuttlers Tian Qing (left) and Zhao Yunlei compete during the women's doubles final match at the BWF (Badminton World Federation) World Championships in Copenhagen, Denmark on Sunday. Photo: CFP

China's Tian Qing and Zhao Yunlei added a world championship title to their Olympic crown in Copenhagen on Sunday by defeating compatriots Yu Yang and Wang Xiaoli in the ­women's doubles final.

Tian and Qing, who won Olympic gold at London 2012, secured the first gold medal of these championships with a 21-19, 21-15 victory over their fourth-seeded opponents to claim their maiden world title. The fifth-seeded pairing also completed their collection of world ­medals having finished as runners-up in 2011 before claiming bronze a year ago.

Tian and Qing used a sequence of four successive points from 10-8 down to take control of the first game before Zhao capitalized on the ­couple's third set point when she ­intercepted a mid-court rally.

Yu, a three-time defending champion, and her partner Wang, gold medalist in 2011 and 2013, were then leading the second set 14-13 before their rivals pocketed seven straight points to move to the cusp of the title with Zhao and Tian then dropping to their knees in celebration as the ­former found the open court on match point.

The win gave the experienced Zhao a seventh world championship medal after another a 2009 silver and 2010 bronze in the same event as well as gold (2011) and bronze (2013) in the mixed doubles.

Spain's Carolina Marin pulled off a monumental ­upset as she beat Chinese world No.1 Li Xuerui to win the women's singles title. The 21-year-old ninth seed recovered from dropping the opening game to complete an incredible 17-21, 21-17, 21-18 victory and earn her country its first-ever major title in the sport.