Kammala jumla mai zuwa: Gregory ya zama kwararre bayan ya taka leda a gasar Walker Cup ta 2017. Ya buga wasu wasanni a ƙarshen 2017 kuma ya gama a matsayi na 8 a cikin Challenge de España. Ya yi fama da rauni a cikin 2018 kuma bai sami nasara ba. Ya cancanci zuwa
2018 US Open, ya zira kwallaye 67 da 69 a cikin cancantar sashi a Walton Heath Golf Club, babban gasarsa ta farko a matsayin kwararre. Ya zira kwallaye 92 a zagaye na farko na US Open, gami da 10 bogeys, 3 biyu-bogeys da 2 sau uku-bogeys kuma, duk da zagaye na biyu 75, ya gama ƙarshe na masu fafatawa 156. Koyaya kakar wasan ta ƙare cikin nasara lokacin da ya sami katin yawon shakatawa na Turai na 2019 ta hanyar Q School bayan ya gama a matsayi na 11 a zagaye na ƙarshe na zagaye 6.