Like a lot of sports, tennis is played better with an audience: You don't let your feet get lazy or stick to safe shots when people are watching. You want them to see you ace your serves and charge the net on returns. But unless you're Roger Federer, your matches aren't likely to draw a crowd. The next best thing is Center Court at Gates Tennis Center, where $5 an hour for singles or $6 for doubles will make you feel like a star even if no one is there. Set below ground and separated from the others by a cement ledge, the court has a decided air of importance. (And the ledge makes for excellent spectator seating in case any fans do show up.) You could say it's an ace in the hole.