England's Matt Wallace wins BMW International Open in Germany
The world No 91 held off a record-breaking charge by Thorbjorn Olesen to claim a one-shot win over the Dane, Martin Kaymer and Mikko Korhonen, who tied for second.
Scotland’s Scott Jamieson finished in a tie for 12th, five shots off the lead after a final 70, earning €31,650 (£27,830).
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Hide AdWallace was back in the clubhouse when Kaymer, who was one shot down with two holes to play, bogeyed the 17th and effectively handed the 28-year-old the biggest title of his career to date and a first prize of €333,330 (£293,120).
“The BMW is such a great event and to play against the likes of Martin Kaymer and the guys at the top there, it’s great,” Wallace said.
“I work hard for this. I believe I can do it. I want to go further, I want to keep building on this. Obviously this gives me a lot of confidence to go on and play well, and I want to kick on and hopefully do this in the bigger events from now on.
“This is great, this is a step in the right direction. We’ll keep working hard towards bigger and better things.”
Olesen had come from nowhere to record an 11-under-par round of 61, which put him in a three-shot lead before the leading pairs had even started the final round.
Olesen produced nine birdies and an eagle to record the lowest-round score in the history of the tournament, which Wallace – who started the day two shots off the lead – set about reeling in.
Birdies on the 13th and 15th saw him take a share of the lead before an excellent tee shot on the 16th set him up for what proved to be a third European Tour title of his career.
Sergio Garcia also finished tied for 12th place on five under par, while Tommy Fleetwood was way back on four over.