Sitting solo second is Heck, whose round featured a major highlight during the morning wave. Facing a steady breeze on Muirfield's testing 16th, the Frenchwoman executed a five-iron that found the bottom of the cup for her second career hole-in-one.
She said, "I struck it pretty well. "It was into the wind so I hit it a bit low with a fade and then I just saw it bounce. Then I was like, 'It might be in,' and then, yeah, it was in. We all laughed and clapped. It was good."
Remarkably, Heck was not the only player, let alone Frenchwoman, to find magic on the short holes today. Championship debutant Gisele Zhou also recorded a hole-in-one during her opening round on the 4th.
Despite sitting towards the top of the leaderboard, Heck is keeping her expectations firmly in check.
She said, "It's a long, long tournament, so I'll just go day by day and see how I feel every day. I really like this championship. Everything is perfect, everybody is so welcoming and the organisation is perfect. I just want to keep the momentum going and keep doing what I'm doing."