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Clay Buchholz was 9-0 with a 1.71 ERA when he went down on June 8. He was Max Scherzer before Max Scherzer. Buchholz would likely have been the starting pitcher for the American League in the All-Star Game instead of Scherzer, had he kept up his tremendous season. But neck issues have sidelined him for more than a month now and Buchholz won’t pitch until he’s 100 percent. Whether he’s turned the corner will depend on how he responds during a bullpen session Thursday in Boston. The Red Sox need him back, and his return to action would be like making a huge in-season trade.