On Friday Zach McAllister struck out the side in the 1st inning, then got demolished in the 2nd. He gave up 8 runs that frame, all earned, having issued three walks and given up two big home runs. He recorded only one out before being put out of his misery. It was maybe the worst inning by any Indians pitcher in recent history.
Here is every instance of a Tribe pitcher giving up 8+ runs in an inning since the turn of the century:
July 31, 2001, Jake Westbrook
In the 3rd inning at home against the Athletics, Westbrook gave up 8 runs on 6 hits, including a 3-run homer by Eric Chavez. Westbrook also hit a batter, but didn't walk anyone. There was an error in the inning, so "only" 7 of the runs were earned. Westbrook was pulled having recorded one out.
April 16, 2002, Chuck Finley
In the 2nd inning in Chicago against the White Sox, Finley gave up 9 runs on 7 hits, including a pair of home runs, one of which was a Magglio Ordonez grand slam. He also walked a batter, while an error that led off the inning meant 8 of the runs were earned. Finley was pulled having recorded two outs.
July 5, 2006, Paul Byrd
In the 4th inning at home against the Yankees, Byrd gave up 8 runs on 7 hits, including a home run. He didn't walk anyone though, and two errors meant that only 3 of the runs were earned (both by Aaron Boone, who made 3 errors in the game). He was pulled having recorded two outs.
July 21, 2006, CC Sabathia
In the 3rd inning at home against the Cubs, Sabathia gave up 8 runs on 5 hits. All the hits were singles, and when he exited the game, having recorded one out, only 5 of the runs had scored, but the bases were loaded, and three of those runners came around to score. All of the runs were earned. Sabathia was pulled after recording two outs.
August 23, 2006, Paul Byrd
In the 1st inning in Kansas City against the Royals, Byrd gave up 9 runs on 8 hits, including two home runs. He didn't walk anyone, and similar to the game above (only seven weeks earlier), an error meant only 3 of the runs were earned. He was pulled after recording two outs.
September 14, 2011, David Huff
In the 4th inning in Texas against the Rangers, Huff gave up 8 runs on 6 hits, including two home runs, one of which was a Josh Hamilton grand slam. he also walks one, but an error (by rookie Lonnie Chisenhall) meant only 3 of the runs were earned. Huff was able to finish the inning.
August 6, 2012, Zach McAllister
In the 2nd inning at home against the Twins, McAllister gave up 9 runs on 6 hits, including back-to-back home runs by Josh Willingham and Justin Morneau. He also issued 2 walks, but an error by Carlos Santana meant only 2 of the runs were earned. McAllister was pulled having recorded two outs.
May 16, 2014, Zach McAllister
In the 2nd inning at home against the Athletics, McAllister gave up 8 runs on 5 hits, including two home runs, one of which was a Josh Reddick grand slam. He also issued three walks, and there weren't any errors, so all of the runs were earned. McAllister was pulled having recorded one out.
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Three times this century an Indians pitcher has allowed 9 runs in an inning, but they were never all earned, so 8 earned runs is the highest total. Given that McAllister matched that total, while giving up multiple home runs and issuing multiple walks, and is one of only two pitchers on this list who recorded only one out, I think McAllister's 2nd inning last week is the very worst inning by any Indians pitcher this century.