In June 2015, Greenbank competed at the inaugural 2015 European Games in Baku, He won 2 gold medals in (200 m, 100 m backstroke) and breaking a new Junior World record in 200 m backstroke at the 2015 European Games clocking in 1:56.89. He also took silver medals in 4 × 100 m medley (with Duncan Scott, Charlie Attwood, Charlie Attwood) and in 4 × 100 m mixed medley.