New Delhi, Jan. 20 -- Ace star shuttler Saina Nehwal confirmed her retirement from competitive badminton on Monday. Saina said that a chronic knee condition had left her unable to cope with the physical demands of the elite sport. The 2012 London Olympic bronze medallist once listed three 'scary' rivals of her career while she asserted that there was no rivalry between contemporary player PV Sindhu.

Saina Nehwal shared one of the most lopsided rivalries in modern badminton, with the Spanish shuttler Carolina Marin and Taipei badminton player Tai Tzu Ying and China's Wang Yihan, with the latter being the "nemesis" for Nehwal.

Ace star shuttler Saina Nehwal confirmed her retirement from competitive badminton on Monday. Saina said that a c...