"Borg was a paranormal phenomenon. I always said he was a “calm madman.” His madness was well disguised. He spent all day adjusting the tension of his racket strings. One day or another you'll crack, I told him, your brain will explode. It did explode one day, after losing to McEnroe at Wimbledon. He retired at 26, when he was still the strongest of them all. He was fed up. Björn was a very funny man. He never had a penny in his pocket. He used American Express, but credit cards didn't exist in Italy at the time."