user: Question: What is Average Year, when Round is R128 (first round)?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Opponent', 'Rank', 'Round']
Types: ['text', 'real', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Win', 1997.0, 'Aegon International , Eastbourne, Great Britain', 'Grass', 'Wiltrud Probst', 89.0, 'Q-R32']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Round" = 'R128 (first round)';