Navratilova predicts tough fight for Federer

Martina Navratilova expects Rafael Nadal and Novak Djokovic to be the dominant forces in men’s tennis in the coming years, insisting it is “difficult to see” Roger Federer reclaiming the number one spot.

Federer has established himself as one of the game’s all-time greats, winning 16 grand slam singles titles – a record for a male player – and at one point holding the top ranking for 237 weeks in succession.