Question: WHAT WAS THE SURFACE MADE OF WHEN THE OPPONENT WAS George Khrikadze?
SQL: SELECT "Surface" FROM "1-16741821-8" WHERE "Opponent" = 'George Khrikadze';

Question: WHAT WERE ALL OF THE RESULTS WHEN THEY PLAYED AGAINST Lithuania AND THE SURFACE WAS MADE OF Clay?
SQL: SELECT "Result" FROM "1-16741821-8" WHERE "Surface" = 'Clay' AND "Against" = 'Lithuania';