TORONTO -- Red Sox right-hander Walker Buehler returned to Boston on Thursday to have tests on his sore right shoulder and won't start against the Minnesota Twins on Friday, manager Alex Cora said.
Rookie Kristian Campbell was scratched from the series finale against the Blue Jays in Toronto because of right rib discomfort, the Red Sox said. Rob Refnsyder came in to play left field and Jarren Duran moved from left to center.
Buehler is 4-1 with a 4.28 ERA in his six starts since signing a one-year, $21.