From 2011 to 2016 Webster was selected to represent Victoria in the senior men's eight contesting the King's Cup at the Interstate Regatta within the Australian Rowing Championships.

Webster's Australian representative debut was as cox of the men's eight selected to compete at the 2009 World Rowing U23 Championships in Racice.

[3] In 2010, Webster's first year in senior representative Australian crews, he experienced World Championship success at Lake Karapiro 2010 in the stern of the lightweight Australian men's eight – a silver medal – and in the bow of a heavyweight coxed pair rowed by Chris Morgan and Dominic Grimm to a gold medal and their first World Championship title.

The Australian men's lightweight eight with six rowers returning from 2010 raced their final to perfection coming through the field from the 500mark, sitting second at the 1000 and the 1500, and running down the Italians in the last 200m to take the gold by 0.17seconds, winning Webster his second World Championship title.

[3] The 2014 World Rowing Cup I was in Sydney early in 2014, a number of experienced Australian seniors had returned to the eight and with Webster in the stern they won at that regatta.