HANA MANDIKLOVA: NETTING A PROFIT
WASHINGTON THE Saturday night queues already had begun at Gepetto, Viet Huong, Bistro Francais, The Big Cheese and other gourmet stops along Georgetown's restaurant row. Inside Yates Fieldhouse on the Georgetown University campus, however, Hana Mandlikova, her body still experiencing jet lag after a 15-hour trip from Prague and Amsterdam, was trading shots with Betty Stove, her coach and friend. Wearing a white sweatshirt for part of the practice with the words ''It's Great to Be A Champion'' printed across the front, Miss Mandlikova seemed oblivious to time zones or travel fatigue. She bounced on her toes, waved a wooden racquet almost magically in her right hand, punched through volleys and put away over heads. ''That T-shirt looks good on you,'' an impressed spectator said, at the conclusion of the 45-minute drill that attracted curious crowds of students from adjacent basketball and tennis courts.