Table: matthias_bachinger_match
Columns: outcome
tournament
surface
opponent
score

Question: Which opponent used a grass surface?
SQL: SELECT "opponent" FROM matthias_bachinger_match WHERE "surface" = 'grass'

Question: Which tournament had a score of  6–7 (0–7) , 6–2, 4–6?
SQL: SELECT "tournament" FROM matthias_bachinger_match WHERE "score" = '6–7 (0–7) , 6–2, 4–6'