LONDON (AP) — Here are five things to look out for at the London Olympics on Saturday:

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1. HISTORY MADE: Oscar Pistorius became the first amputee to run in an Olympic track event, winning his 400-meter heat on carbon-fiber blades.

2. 100M DASH: On the eve of the much-anticipated final, Jamaica's Usain Bolt limbered up with a heat victory in 10.09 seconds and compatriot Yohan Blake made it in 10.00. American Tyson Gay finished his in 10.08.

3. FAREWELL PHELPS: It's the end of an era. Michael Phelps swims his last competitive race, the 4x100 medley relay. It's one the Americans have never lost.

4. TENNIS FINAL: It's Maria Sharapova vs. Serena Williams for Olympic gold at Wimbledon.

5. US MEDAL HAUL: They've set themselves an overall target of 30 track and field medals. How many will the Americans manage Saturday?