They mean to win Wimbledon

I’m curious as to what extent the concept of Great Britain triggers nationalistic emotions in the context of sports (or sport). Do English tennis fans root for Scotsman Andy Murray because he’s “British?” Or is that a meaningless category except in regard to trivia such as “first British man to reach the Wimbledon final in 74 years?”

I notice that Great Britain competes as a single entity in the Olympics, but not in competitions such as the soccer World Cup. I imagine the politics of such decisions must be complex.