Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23408094_14 (tournament_at_which_lead_began VARCHAR, player VARCHAR, titles_won_at_point_of_lead VARCHAR)

### Question ###
At which tournament did william renshaw begin his lead when he had won 7 titles?

### Accurate SQL ###

SELECT tournament_at_which_lead_began FROM table_23408094_14 WHERE player = "William Renshaw" AND titles_won_at_point_of_lead = 7