Sylvia Hanika won her lone WTA Finals title in 1982 – it was the biggest WTA title of her career.

Jana Novotna served, volleyed, chipped, charged and sliced her way to the WTA Finals title in 1997.

Lindsay Davenport won the 1999 WTA Finals trophy in front of her home fans at Madison Square Garden.

Maria Sharapova rallied from 4-0 down in the third set to beat Serena Williams for the 2004 title.

Amélie Mauresmo won the WTA Finals in 2005 – she went on to win her first two majors the next year.

Venus Williams conquered the WTA Finals in Doha in 2008 and is still going strong on the tour today.

Petra Kvitova is also among the one-time winners at the WTA Finals, conquering Istanbul in 2011.

And last but not least among the one-time winners is the 2015 winner: Agnieszka Radwanska.

Moving on to the two-time champions – we begin with Evonne Goolagong Cawley, who won in 1974 and 1976.

Gabriela Sabatini is also a two-time WTA Finals champion, claiming the year-end title in 1988 and 1994.

Martina Hingis won the title in 1998 and 2000 – the tournament’s last year at Madison Square Garden.

And Justine Henin won the WTA Finals in 2006 and 2007, the only two years the event was held in Madrid.

Moving on to the three-time champions, we start off with Monica Seles, who won in 1990, 1991 and 1992.

Kim Clijsters was also a three-time champion, winning the year-end title in 2002, 2003 and 2010.

Four-time champion Chris Evert won the first WTA Finals in 1972, as well as in 1973, 1975 and 1977.

There are two five-time champions – first Steffi Graf, who won in 1987, 1989, 1993, 1995 and 1996.

And, of course, Serena Williams, who won the year-end title in 2001, 2009, 2012, 2013 and 2014.

Finally, eight-time winner Martina Navratilova: 1978, 1979, 1981, 1983, 1984, 1985 and twice in 1986.