CREATE TABLE table_16645 ("Edition" FLOAT, "Zone" CLOB, "Round" CLOB, "Date" CLOB, "Against" CLOB, "Surface" CLOB, "Opponent" CLOB, "Outcome" CLOB, "Result" CLOB)

How many rounds were 2r?
SELECT COUNT("Result") FROM table_16645 WHERE "Round" = '2R'
SELECT COUNT("Result") FROM "table_16645" WHERE "Round" = '2R'