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ST. LOUIS — From top to bottom, Cubs rookie Matt Shaw’s home-run swing Sunday looked far different from the first home-run swing of his career a little more than four months ago.
His hands started higher. He stood up taller. His stance was more open. His leg kick was more subtle.
It was the result of months of adjustments, trial and error. And it all has led to an explosive 3½ weeks out of the All-Star break.
‘‘I think Matt’s always going to be a bit of a tinkerer mechanically,’’ manager Craig Counsell said before the Cubs’ 3-2 loss to the Cardinals.