Former world No.1 Jason Day was surprised to be struck by a major bout of nerves on his Olympic debut as Japanese star Hideki Matsuyama set the pace at Le Golf National.
Matsuyama, the 2021 US Masters champion, opened with an eight-under 63 on Thursday to sit two shots clear atop a star-studded leaderboard.
Red-hot Xander Schauffele, the defending Olympic gold medallist who has won his first two major titles this year at the US PGA and British Open, was in outright second at 65.
