The venerated site did this, apparently, because for the previous two and a half weeks the Friars had beaten up on 2010 lowlifes Arizona, Chicago and Pittsburgh (with a few Ws over the Giants and Brewers thrown in for good measure). Either way, at one point San Diego had won 10 of 11 and seemed like an unstoppable machine.
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Not content to merely let their cover jinx extend to the power rankings on their website, the blurb within the power rankings alludes to the Padres' 96.7% chance to make the playoffs; according to Baseball Prospectus, best in baseball at that time. These two factors put the Padres in rarefied air - nothing but air, unfortunately.
Know how in the old Looney Tunes cartoons, a character - usually Wile E. Coyote - can run off of a cliff and continue running on air, but only until somebody - usually the Road Runner - points out the situation? Of course you do. That's where the character, succumbing to physics and a huge "Look Down!" sign, plummets comically to a dusty and deserving death. (Ok, not "death" per se, but you get my drift.)