human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Tournament, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, Career SR, Career Win-Loss
###Question: What is Tournament, when Career SR is "ATP Masters Series"?
gpt
SELECT Tournament FROM table WHERE Career SR = atp masters series