Santana was flattened near home plate by the 6-foot-6, 287-pound Washington first baseman in the second inning Sunday. Santana moved to his left to possibly catch an overthrow to first when he inadvertently stepped into the path of a scoring Dunn.
Santana was knocked off his feet and did a backward somersault. Dunn came over to make sure the Indians' top prospect was OK. Santana, listed at 190 pounds, was not injured.
Santana flied out to left in the first against rookie sensation Stephen Strasburg.