A's starter Anderson exits with strained back
After Adam Eaton led off with a single, former Oakland infielder Cliff Pennington hit a sharp grounder that caromed off the glove of third baseman Josh Donaldson.
Nobody was covering third base and Eaton took off. Anderson ran over to the bag but was too late to get Eaton.
Anderson kept twisting and rubbing his neck following the play. After consulting with manager Bob Melvin and the team's medical staff, Anderson exited.