Challengers by country
Germany
29
France
28
Sweden
25
Poland
20
Spain
18
Denmark
13
Turkey
13
Netherlands
12
United Kingdom
9
Portugal
7
Norway
6
Serbia
6
Austria
5
Bulgaria
5
Finland
4
Belgium
4
Greece
4
Russia
4
Croatia
4
China
4
Switzerland
3
Slovakia
3
Czech Republic
3
Lithuania
3
Romania
3
Estonia
2
South Korea
2
Slovenia
1
Lebanon
1
Montenegro
1
Macedonia
1
Albania
1
Bosnia and Herzegovina
1
Ukraine
1
Algeria
1
Italy
1
Hungary
1
Australia
1