Watch: Serena Williams sings 'Under the Sea' at US Open Karaoke

Serena Williams is trying to ignore "the elephant in the room" ahead of the US Open. She chose to channel any nervous energy into singing at a karaoke night sponsored by Delta Air Lines, now in its second year. Before the show, she said she was more worried about her song choice than her tennis game. "I'm gonna make a game time decision. I always get so nervous every year like, 'I don't know what to do, I don't know what to do,'" she said. Williams, 33, ended up choosing "Under the Sea" from "The Little Mermaid," complete with dance moves and Caribbean accent. "We just kind of wanted to celebrate just kicking off (the) U.S. Open and having fun and relaxing and enjoying it," said Williams.