Niemann akahwina 2017 Mark H. McCormack Medal nokuti ari pamusoro-rakava mutambi mu World Amateur Golf Ranking panguva mhedziso zhizha kuti Championship mwaka, nokudaro kuwana kupinda muna 2018 U.S. Open
uye kupinda mu2018 Open Championship. Akakunda 2018 Latin America Amateur Championship achiwana kupinda zvakare mu2018 Masters Tournament.