Challengers by country
Germany
34
Sweden
25
France
24
Turkey
23
Poland
20
Spain
13
Denmark
12
Netherlands
10
Norway
8
United Kingdom
8
Greece
6
Austria
6
Romania
6
Portugal
6
Bulgaria
6
Czech Republic
5
Finland
5
Belgium
5
Russia
5
Lithuania
4
Hungary
3
Italy
3
South Korea
3
Switzerland
3
Serbia
2
Macedonia
2
Croatia
2
Israel
1
Slovenia
1
Estonia
1
Slovakia
1
Ukraine
1
Saudi Arabia
1
Lebanon
1
Australia
1
Morocco
1
Tunisia
1