The Houston Astros opened as the biggest World Series favorite since 2007, according to Caesars Sports Book. But a rescued dolphin in Clearwater is going with the upset.Nicholas the rescued dolphin at Clearwater Marine Aquarium selected the Washington Nationals over the Houston Astros to win the World Series, which starts Tuesday night in Houston. (Watch video above).According to the aquarium, Nicholas was found stranded in 2002 with severe sunburns. He correctly picked the Astros to win the 2017 World Series over the Los Angeles Dodgers.Worth mentioning: Pinkfong’s campfire ditty “Baby Shark” has become the Nationals’ anthem . Coincidence?