Kim Clijsters has urged Belgium to capitalise on any frustration shown by Andy Murray in the Davis Cup final.
World number two Murray is undoubtedly the key figure for Great Britain, who are seeking to win the competition for the first time since 1936, and will be favoured to triumph in each of his singles rubbers in Ghent next weekend.
However, Clijsters - a Fed Cup winner for Belgium in 2001 - believes the improving David Goffin can make life difficult for Murray, who exited the ATP World Tour Finals in London last week after losses to Rafael Nadal and Stanislas Wawrinka.
And the former women's world number one feels it is crucial the hosts seek to "get under the skin" of the Scot if he finds himself under pressure.
"I'd say Belgium have a 50 per cent chance of winning the Davis Cup," Clijsters told Het Nieuwsblad.
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"Much will depend on how Goffin deals with the pressure. But Murray will feel plenty of pressure as well. I think Murray can be broken emotionally and mentally.
"I don't mean that he will be influenced by the crowd. He will be used to it and knows everybody will be against him. That might even give him an additional boost to focus.
"I do hope that he will start getting doubts about himself because of Goffin's tennis and will get annoyed. You have to get him at that point. That's when the crowd can do something extra.
"Murray can pull anything off is he is feeling well, but you always see his body language change in a negative way if things are not going his way. You have to keep trying to get under his skin even if he is playing well."
The final is still scheduled to take place in Ghent despite raised threat levels in Belgium following last week's terror attacks in Paris.
ITF president David Haggerty said: "We are aware that Belgium has raised the terror alert level for Brussels. This greatly concerns us but, at the present time, we are still continuing with preparations for the final."