SAN FRANCISCO — The big black cat almost used up its last life at the start, burying its bows in a wave and falling behind a boatload of Kiwis. Of course, it was only fitting in this America's Cup that Oracle Team USA would need to survive near-defeat again. With one last spectacular push in a winner-take-all finale Wednesday, the United States managed to hang onto the Auld Mug in closing out the longest, fastest and, by far, wildest America's Cup ever with one of the greatest comebacks in sports.