* South Korean opens with a 67 at Sebonack * Ends first round a stroke off lead (Adds Kim detail and quotes, paras 15-17) June 27 (Reuters) - South Korea's in-form Park Inbee made an ideal start in her pursuit of a third major crown this year as she charged into contention for the U.S. Women's Open in Southampton, New York in Thursday's opening round. Taking advantage of some favourable tee positions, the world number one birdied four of her last nine holes to fire a superb five-under-par 67 at Sebonack Country Club, ending the day a stroke behind her pacesetting compatriot Kim Ha-neul. ... More...