They excite and inspire us, frustrate and disappoint us - when great sporting rivals meet, we live each moment with them as their fortunes fluctuate. During the past few decades, we have witnessed many superbly matched opponents in a wide range of sports. Who can forget the marathon matches played by John McEnroe and Bjorn Borg, the nail-biting fights between Joe Frazier and Muhammad Ali, the generational clash of Jack Nickalus and Arnold Palmer, the ice-queen encounters between Tonya Harding and Nancy Kerrigan? Or the classis rivalries between Ayrton Senna and Alain Prost, Sebastian Coe and Steve Ovett, Margaret Court and Billie Jean King, or the most enduring competitors of all: the Celtic and Rangers football clubs. These are just a few of the great rivalries featured in this fascinating book.