Jordan Spieth struggles, Jason Day OK after Australian Open’s 1st round

Defending champion Jordan Spieth struggled in gusty afternoon winds Thursday at the Australian Open in Sydney, but Jason Day took advantage of more calm morning conditions.

The result was that the tournament’s marquee players were overshadowed by first-round leader Cameron Davis, who shot an 8-under-par 63 at the Australian Golf Club.

That left Day, making his first competitive appearance in his home country since 2013, three strokes behind after a 66. Spieth, trying to win the Aussie for the third time in four years, was seven strokes behind after shooting 70.

•S.S.P.