Tatsunori Nukaga posted an opening round of 66 to head the field at the Bridgestone Open.

Nukaga carded five birdies and an eagle at Sodegaura Country Club with a bogey at the third his only blemish to lead the way on six under par.

The 25-year-old holds a one-stroke advantage over Naoya Takemoto, Yuta Ikeda and Hiroyuki Fujita after the trio all carded 67s.

A further six players are bunched at four-under including veteran Australian Craig Parry, who sank four birdies in his flawless 68.