Watch: Si Woo Kim makes longest hole-in-one in British Open history

Kim's brilliant shot was the first hole-in-one of the week at Royal Troon. According to Justin Ray of The Athletic, it also marked the longest ace in British Open history (since 1980). 

Kim isn't the only one putting up low scores in Scotland. Royal Troon plays the easiest it has all week due to the calm winds and light precipitation. Adam Scott and Sungjae Im jumped up the leaderboard with a pair of 5-under 66s. Justin Thomas is currently 5 under through 13, and South African Thriston Lawrence is looking to challenge the course record after his 6 under start through 10. 

The wind and rain are expected to pick up as the afternoon wears on. For now, though, this is shaping up to be a dramatic Moving Day with birdies available for the taking. Shane Lowry leads the championship by two shots at 7 under par, but his lead isn't safe under these scoring conditions.