Here are five things to look out for at the London Olympics on Sunday:

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1. BRITAIN'S MORNING AFTER: Jubilation over what happened at the track Saturday night spills into Sunday, with British athletes - Jessica Ennis foremost among them - lofted heartily onto the collective national shoulders.

2. AND SPEAKING OF THE TRACK: Three key things to watch there Sunday above the others - Bolt, Bolt and Bolt. And did we mention Bolt? Also Yohan Blake, the other formidable half of the Jamaican dynamic duo.

3. FROM ENNIS TO TENNIS: Roger Federer goes for the gold for Switzerland against Britain's Andy Murray in a Wimbledon final rematch on the same Centre Court. Also: Americans Venus and Serena Williams take on the Czech Republic in doubles for the gold.

4. IN THE GYM: After Gabby Douglas' gold medal, her U.S. teammate McKayla Maroney gets a chance at the spotlight as the prohibitive favorite in the vault final. The field also includes Oksana Chusovitina of Germany and Giulia Steingruber of Switzerland.

5. WRESTLING BEGINS: Time to hit the mat. Watch Iran, which comes in with lots of talent and high hopes to win its first Greco-Roman wrestling gold.