The cream of men\'s sprinting and Russian pole vaulting legend Yelena Isinbayeva will make their bow on the second day of the athletics programme of the Olympics on Saturday. Defending Olympic champion Usain Bolt and Jamaican teammates Yohan Blake and Asafa Powell will run heats and round one of the 100m alongside US rivals Tyson Gay and Justin Gatlin, with the semi-finals and final scheduled for Sunday. The 100m remains the premier track and field event, and arguably of the whole Olympics, with an especially thrilling final in prospect in London.LONDON (AFP) - (AFP) - The cream of men\'s sprinting and Russian pole vaulting legend Yelena Isinbayeva will make their bow on the second day of the athletics programme of the Olympics on Saturday. Defending Olympic champion Usain Bolt and Jamaican teammates Yohan Blake and Asafa Powell will run heats and round one of the 100m alongside US rivals Tyson Gay and Justin Gatlin, with the semi-finals and final scheduled for Sunday. The 100m remains the premier track and field event, and arguably of the whole Olympics, with an especially thrilling final in prospect in London. \"I\'m physically and mentally ready for the Games, of course, but as a human, I\'m worried like any other competitor,\" said Isinbayeva, who failed to record a height in a tear-stained 2009 world championships in Berlin and came just sixth in last year\'s worlds in Daegu, South Korea. Home hopes will be riding with pin-up heptathlete Jessica Ennis, provided she safely negotiates Friday\'s opening day. The heptathletes will take part in the long jump and javelin in the morning session before completing the gruelling seven-discipline event with the 800m. Another of Saturday\'s six finals will see Ethiopian running star Kenenisa Bekele in the men\'s 10,000m. Bekele has not had an ideal run-in to the Games, and appears to have just the one medal chance in London, given he has been named as a replacement only for the 5,000m. Events (qualifying heats unless specified) Men 100m, 400m, 400m hurdles; 10,000m (final), long jump (final), 20km walk (final) Women 400m, 3000m steeplechase, pole vault; 100m (final), heptathlon (final), discus (final)