Question: What is the Season when the Opponent was Zenit St. Petersburg?
SQL: SELECT "Season" FROM "2-1573615-5" WHERE "Opponent" = 'Zenit St. Petersburg';

Question: What is the Opponent with a Round of Q2, in the 2005–06 season?
SQL: SELECT "Opponent" FROM "2-1573615-5" WHERE "Round" = 'Q2' AND "Season" = '2005–06';

Question: What is the Competition for Season 2002–03, and the Opponent was Zenit St. Petersburg?
SQL: SELECT "Competition" FROM "2-1573615-5" WHERE "Season" = '2002–03' AND "Opponent" = 'Zenit St. Petersburg';

Question: What is the Round when the series shows 5th place, and a Season of 2006–07?
SQL: SELECT "Round" FROM "2-1573615-5" WHERE "Series" = '5th place' AND "Season" = '2006–07';

Question: What is the Series for the UEFA Cup, in the 2006–07 season, and a Round of Group, and an opponent of AZ?
SQL: SELECT "Series" FROM "2-1573615-5" WHERE "Competition" = 'UEFA Cup' AND "Season" = '2006–07' AND "Round" = 'Group' AND "Opponent" = 'AZ';