Nationals outfielder Gerardo Parra has signed with Japan's Yomiuri Giants, ending his short-lived yet sensational career in Washington, MLB Trade Rumors reported early Wednesday. Parra, known for his allegiance to "Baby Shark" became the catalyst for good mojo in the Nats' clubhouse. "Baby Shark" became the unofficial anthem of the Nationals' first-ever World Series championship thanks to Parra declaring it his walkup song in June to please his two-year-old daughter.