The odds makers say the Los Angeles Dodgers, the Detroit Tigers, or the St. Louis Cardinals are the most likely to take Major League Baseball's top honors this year, but of course nothing is certain in sports. If you really want to see a return on your investment, consider backing one of these underdogs. They might seem like long shots, but these MLB teams have the potential to defy the odds. San Francisco Giants Could Go Back to Back   Image via Flickr by eekim As the reigning champions,