Winnington meunang tilu medali perunggu di 2017 FINA World Junior Swimming Championships
dina 200 m gaya bébas jeung gaya bébas jeung relay medley. Terobosan Winnington bakal datang dina Kaulinan Pasamakmuran 2018 dimana anjeunna meunang emas dina gaya bébas relay barengan Kyle Chalmers, Alexander Graham sareng Mack Horton. Waktu tim relay 7:05.97 mangrupa rékor kaulinan.