Challengers by country
Germany
34
France
31
Turkey
23
Poland
20
Sweden
16
Spain
15
Denmark
14
Netherlands
11
United Kingdom
10
Russia
7
Bulgaria
4
Portugal
4
Austria
4
Finland
4
Greece
4
Norway
4
Czech Republic
4
Serbia
4
South Korea
4
Croatia
3
Romania
3
Italy
3
Belgium
3
Israel
3
Switzerland
3
Latvia
2
Ukraine
2
Lithuania
2
Montenegro
1
Afghanistan
1
Estonia
1
Tunisia
1
Macedonia
1
Australia
1
Bosnia and Herzegovina
1
Slovakia
1
Luxembourg
1
China
1
Lebanon
1