What was the 2nd leg for team #1 River Plate?
CREATE TABLE "round_of_16" (
  "team_num1" text,
  "points" text,
  "team_num2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "2nd_leg" FROM "round_of_16" WHERE "team_num1"='River Plate';