Andy Murray's participation marks Great Britain down as favourites to defeat Belgium and lift the Davis Cup, according to Roger Federer.
GB have seen off United States, France and Australia en route to this week's final in Ghent, which will be played on clay as Belgium look to make use of home advantage.
World number two Murray will lead his team - which also features his brother Jamie, as well as Kyle Edmund and Dominic Inglot - while David Goffin - ranked 16th in the world - heads up the Belgian side.
And Federer, who helped Switzerland to a 3-1 win over France in last year's final, believes Murray's presence could prove key as GB seek a first title since 1936.
"Great Britain are the favourites, in my opinion, because they have Andy in the team," he said.
"It's nice to have someone like him in the team that can play singles, doubles, singles if he had to.
"Even if he doesn't play, they still have a very strong doubles [team], because doubles can always be crucial.
"Then again, Belgium is at home. I really like Goffin, a great player. Good guy, too. Great attitude. I feel like he's the kind of guy that can handle pressure.
"But still in most of the matches they [Great Britain] have their chance, that's why I favour them in the final."