He also has good sportsmanship, to his credit.

to 在这里是介词，表示方向或归属关系。 his 是代词 he 的所有格形式，表示"他的"。 credit 本义是"信用、信誉"，引申为"赞扬、荣誉"。 to his credit 是一个固定短语，意思是"值得赞扬的是"或"为他增光的是"，用来指出某人值得肯定的品质或行为。