Here's what to watch for at the London Olympics on Sunday.
1. SWIMMING: The United States, Australia and France go for gold in the final of the 4 x100m freestyle relay, a day after Michael Phelps was stunningly defeated by teammate Ryan Lochte.2. BASKETBALL: The U.S. mens team plays France (and NBA star Tony Parker).3. FANS: Londoners and visitors are craving tickets for the Olympics yet many seats have been empty so far. Will organizers be able to ensure a full house even if it means giving them away?4. A BRITISH ROYAL: Zara Phillips took part in the eventing dressage competition. Shes the daughter of Princess Anne and rode a horse called High Kingdom.5. THE HOSTS: Can Britain get on the podium? The country had high hopes of a medal on Saturday but fell short. Will their luck change?