dunno, not recently for sure. I don't think MLB should do it, but it's not really the end of the world. I saw a mercy rule in the WBC and it was a lot of fun actually, I didn't feel cheapened. There's an additional element of drama to it. You're going to the bottom of the 7th down 11, you know you gotta score two. There's some heightened drama there, some interest. Is the game about to end? Certainly more than a 12-1 game would generally ever give. You're basically trading the very very rare huge 8th/9th rally that happens almost never for regular late-inning interest in blowouts. Plus saving 2 innings of work, and time. The time thing is a good one I think. Most people don't actually have a problem with any given baseball game's length, but there are slogs within games, or within seasons, that can wear on you. Cut out two innings of blowout baseball from a few games? Sure, why not. And we've got data on how likely a 9th inning comeback is down 9-3. If the skys open up and you know that you're not getting back on the field for 2 hours, AND you're game is cross country tomorrow or something? Get the two managers together with the umpires and 'secretly' forfeit. Game over, no waiting, let's go home. Even from a fan experience, who's really missing milling around a rainy empty stadium for 2 hours to see 15 pitches and a few strikeouts?