CREATE TABLE table_63136 ("Match" FLOAT, "Date" CLOB, "Competition or tour" CLOB, "Ground" CLOB, "Opponent" CLOB, "Score1" CLOB)

What ground had Portsmouth reserves as an opponent?
SELECT "Ground" FROM table_63136 WHERE "Opponent" = 'portsmouth reserves'
SELECT "Ground" FROM "table_63136" WHERE "Opponent" = 'portsmouth reserves'