There are 3 innings in a baseball game. There are 11 batters. In the first inning the batting line up is 1,2,3?

There are 3 innings in a baseball game. There are 11 batters. In the first inning the batting line up is 1,2,3,4,5,6,7,8,9,10,11.? In the second inning the batting line up is 11,10,9,8,7,6,5,4,3,2,1.? What should the batting line up sequence be in the third inning so that it is fair to everyone?