Challengers by country
Germany
34
France
34
Turkey
22
Sweden
22
Poland
21
Spain
12
Denmark
11
United Kingdom
10
Netherlands
9
Czech Republic
7
Bulgaria
6
Russia
6
Austria
5
Greece
5
Serbia
4
China
4
Norway
4
Belgium
4
Slovakia
3
Estonia
3
South Korea
3
Switzerland
2
Hungary
2
Lithuania
2
Brazil
2
Portugal
1
Finland
1
Moldova
1
Latvia
1
Croatia
1
Australia
1
Israel
1
Ukraine
1
Saudi Arabia
1
United States of America
1