That time came on Sunday in Corning, N.Y., as the 30-year-old finally broke through for her first win on the LPGA Tour at the Corning Classic.
Koch fired a flawless final round of 66, which was good enough to see her through to a total score of 18-under-par 270 and a two-stroke victory over Mhairi McKay (70) and Maria Hjorth (69).
It's great, exclaimed Koch following her round. I'm not sure if it's hit me yet. It will take a little while. It's really more a feeling of relief than I thought it was going to be.
Following Saturdays round, which saw her two shots off the lead, Koch claimed she needed a good score on Sunday to give herself a shot.
She did just that right from the beginning.
Koch comments on her win at the Corning Classic
Koch quickly birdied the par-5 2nd and then cashed in another red number at the 4th. On the next hole, the par-5 5th, she hit the green in two with an 11-wood and sank her eagle putt, which propelled her to minus-16.
Two more birdies at Nos. 8 and 12, and it was all downhill from there.
I think it was really good for me to play in the last group today, Koch said, because I think for me, I need to be there and see what's happening. I've always been a good match player. And I think I do better if I'm up against the people that I need to be.
One of those players she was paired with was third-round leader McKay.
McKay also started well, making three birdies on her front nine, but recorded bogey at No. 11 and a double-bogey at the 17th to eventually fall back of Koch.
If I had lost by one, I definitely wouldn't be happy right now, claimed McKay. To do it in this fashion is kind of annoying, but that's the way it happens. I think to lose is the thing that's most disappointing. Doesn't matter what fashion.
Hjorth was likewise troubled with bogies on Sunday. Her round consisted of seven birdies, but was offset with an unfortunate four bogies mid-round.
For Koch, the win comes on the heels of last years Solheim Cup, where she was one of the top performers on the European team.
Of the experience, she commented: I've started believing I could do it since then. I'm not sure I really truly believed it before.
Prior to this week, she had finished second six times on the LPGA Tour, one of which occurred at this years YourLife Vitamins LPGA Classic.
Full-field scores from the Corning Classic