Challengers by country
Germany
38
France
34
Poland
24
Sweden
18
Turkey
17
Spain
15
Denmark
15
United Kingdom
10
Netherlands
9
Czech Republic
7
Romania
6
Russia
6
Greece
6
Norway
5
South Korea
5
Belgium
4
Israel
4
China
3
Portugal
3
Finland
3
Slovakia
3
Italy
3
Austria
2
Serbia
2
Estonia
2
Bulgaria
2
Switzerland
2
Slovenia
1
Lebanon
1
Latvia
1
Hungary
1
Australia
1
Ukraine
1
Croatia
1
Luxembourg
1
Lithuania
1
Algeria
1