Challengers by country
Germany
33
France
31
Sweden
26
Poland
19
Turkey
17
Denmark
14
Spain
12
United Kingdom
9
Netherlands
8
Norway
8
Czech Republic
7
Serbia
6
Greece
6
Austria
5
China
5
South Korea
4
Finland
4
Lithuania
4
Russia
3
Switzerland
3
Belgium
3
Israel
2
Latvia
2
Romania
2
Estonia
2
Slovakia
2
Hungary
2
Portugal
2
Bulgaria
2
Taiwan
1
Brazil
1
Italy
1
Croatia
1
Slovenia
1
Lebanon
1
Saudi Arabia
1
Montenegro
1
Tunisia
1
Malaysia
1