Do you know which gate he needs to go in? If he's on the east side of the stadium, you should be able to drop him off near the area of 14th and Vine and he can walk towards the stadium that way. If he's on the west side, you also should be able to go down 10th St. or 'stadium drive' and drop him off there. The downside to going over to 10th St. is it's usually very busy and slow because of people walking to the game.