A decision has not been made yet on whether the clay will be red or green, but organizers feel the choice will give the advantage to the Americans, knowing that likely British captain and Wimbledon champion Andy Murray struggles on clay.
Red clay is made from crushed bricks while green is made from crushed stone.
The surface is known to slow down the game, which puts the speedy Murray at a disadvantage.
Capacity for the event is expected to be 8,000, utilizing 2,000 in left field, with 6,000 more being included in a temporary stadium built around the court.
This will be the first time a Davis Cup match will be played in an open-air ballpark in the United States. The United States is undefeated in six Davis Cup matches in the San Diego area.
The final day of the even will coincide with Super Bowl Sunday.