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Tanner Houck’s signature pitch is a sweeping slider. The 25-year-old Boston Red Sox right-hander has gone to it 35.5% of the time this season, and with good results. There is little question that the offering is the most lethal weapon in his arsenal. That said, it’s arguably not his most important pitch going forward — particularly if his future is in the starting rotation, and not out of the bullpen.