Sport | 'I'm worried', admits Djokovic as French Open build-up suffers new setback
![Sport | 'I'm worried', admits Djokovic as French Open build-up suffers new setback](https://cdn.24.co.za/files/Cms/General/d/1136/e94cceecac66428299fbae7393852a64.jpg)
World number one Novak Djokovic admitted he was "worried" about his French Open title defence after falling to 44th-ranked Czech Tomas Machac in the Geneva semi-finals on Friday.