Ko’s challenge

Lydia Ko will have to shoot the lights out to retain her Canadian Open crown. Tournament winner in 2012, 2013 and 2015, the Kiwi world No 1 will start her final round on Monday morning (NZ time) seven shots behind tournament leader Ariya Jutanugarn of Thailand. Ko, the 2016 Rio Olympics silver medallist, shot a respectable two-under par third round of 70 to be tied for 10th in Calgary. However, Jutanugarn, who began the third round as tournament leader, remained in hot form by recording a five-under par 67 to end the round at 17 under.