Japan's world No. 1 pair of Misaki Matsutomo and Ayaka Takahashi claimed their second Japan Open badminton women's doubles title on Sunday, defeating South Korea's Kim Ha-na and Kong Hee-yong in straight games.

Takahashi and Matsutomo, gold medalists at last summer's Rio de Janeiro Olympics, edged their 122nd-ranked opponents 21-18, 21-16 in 56 minutes at Tokyo Metropolitan Gymnasium.

At last year's tournament, the 2014 Japan Open champions Takahashi and Matsutomo were beaten in the final.