Table: petkovic_tournaments
Columns: tournament
2007
2008
2009
2010
2011
2012
2013

Question: What was the 2013 finish for the tournament that had a 2007 finish of A?
SQL: SELECT "2013" FROM petkovic_tournaments WHERE "2007" = 'a'

Question: What was the 2012 finish in the US Open?
SQL: SELECT "2012" FROM petkovic_tournaments WHERE "tournament" = 'us open'

Question: Which tournament had a 2010 finish of 4R?
SQL: SELECT "tournament" FROM petkovic_tournaments WHERE "2010" = '4r'