CREATE TABLE table_9621 ("Edition" CLOB, "Round" CLOB, "Date" CLOB, "Against" CLOB, "Surface" CLOB, "Opponent" CLOB, "Result" CLOB)

What is the round when the match was against sergis kyratzis?
SELECT "Round" FROM table_9621 WHERE "Opponent" = 'sergis kyratzis'
SELECT "Round" FROM "table_9621" WHERE "Opponent" = 'sergis kyratzis'