Question: What surface was played on when Piet Norval was a partner?
SQL: SELECT "Surface" FROM "2-1729366-2" WHERE "Partner" = 'Piet Norval';

Question: What was the surface played on when they were a Runner-up in 2007?
SQL: SELECT "Surface" FROM "2-1729366-2" WHERE "Outcome" = 'Runner-up' AND "Year" = 2007.0;