Challengers by country
Germany
34
France
29
Turkey
18
Spain
15
Sweden
15
Poland
14
United Kingdom
9
Denmark
9
Netherlands
8
Bulgaria
7
Greece
6
South Korea
6
Czech Republic
5
Russia
5
Austria
4
Belgium
4
Norway
4
Romania
4
Hungary
3
Estonia
3
Lithuania
3
Portugal
3
Israel
2
Serbia
2
Macedonia
2
Saudi Arabia
2
China
2
Italy
2
Slovenia
2
Ireland
1
Armenia
1
Luxembourg
1
Ukraine
1
Algeria
1
Montenegro
1
Malta
1
Australia
1
Egypt
1
Bosnia and Herzegovina
1
Latvia
1
Finland
1