Which tennis player won the most titles in her career?

Navratilova holds the records for most singles (167) and doubles titles (177) in the Open Era. Her record as No. 1 in singles (1982–86) remains the most dominant in professional tennis to date. Over five consecutive seasons, she won 428 out of 442 singles matches, averaging fewer than three losses per year to 87 wins, for a sustained winning percentage of 96.8%.