Sunday was a truly “Monster” day for Boston Red Sox first baseman Triston Casas. In the first game of a doubleheader with the Minnesota Twins at Fenway Park, the 24-year-old went deep three times in his first three at-bats, including two three-run home runs and a solo shot for a total of seven RBI in an 8-1 win. It was the first three-homer game of Casas’ career. “I felt the most locked-in I have all season,” Casas said. “The swing felt effortless.”