There's already plenty of buzz at Olympic Stadium about how fast the London Games track is: The PA announcer told the crowd Saturday morning that 52 personal bests and 12 national records were set on Day 1.

And the best men haven't started sprinting yet.

Their time comes Saturday, when Olympic champion and world-record holder Usain Bolt, world champion Yohan Blake and the rest of the men's 100 field are set to run their heats.

The dash semifinals and final are Sunday night.

— Howard Fendrich — Twitter http://twitter.com/HowardFendrich

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EDITOR'S NOTE — "Eyes on London" shows you the Olympics through the eyes of Associated Press journalists across the 2012 Olympic city and around the world. Follow them on Twitter where available with the handles listed after each item.