Question: Out of Chris Evert and Steffi Graf, who won the most grandslam singles titles?

Context paragraphs:
1989 Wimbledon Championships – Women's Singles: Steffi Graf defeated Martina Navratilova 6–2, 6–7, 6–1 in the final to win the Ladies' Singles tennis title at the 1989 Wimbledon Championships.  In her final appearance Chris Evert who was beaten by Graff in the semi-finals, would reach her 52 Grand Slam semi-final an Open Era record.  She would only fail to reach the semi-finals 4 times during her career (52 semi-finals of 56 Grand Slams played).  She would make the semi-final 17 times, missing just once (1983), in 18 Wimbledon's contested.

Graf–Sabatini rivalry: Steffi Graf and Gabriela Sabatini are retired professional tennis players who played each other on 40 occasions between 1985 and 1995.  Steffi Graf was the world No. 1, whilst Sabatini reached a career high of No. 3.  They are both Grand Slam Champions, the German winning 22 titles whilst Sabatini won her only Grand Slam title against Graf.  The pair also teamed up to reach three French Open finals and won the 1988 Wimbledon crown.

1989 Lufthansa Cup – Singles: Steffi Graf was the defending champion going into the final against her rival Gabriela Sabatini.  Just the previous month, Sabatini defeated Steffi Graf 3–6, 6–3, 7–5 in the final at Amelia Island, Florida.  Now, in her native Germany, Steffi would turn the tables against Sabatini, beating her 6–3, 6–1.  Prior to this match, Sabatini had played in four finals in 1989, with her winning twice.  For Steffi, this victory was her seventh of the year, and marked the sixteenth time out of nineteen matches she had beaten Sabatini.

1992 US Open – Women's Singles: Monica Seles was the defending champion, and she successfully defended her title without losing a set, defeating Arantxa Sánchez Vicario in the final, 6–3, 6–3.  By reaching the final, Seles became the sixth woman, after Maureen Connolly, Margaret Court, Chris Evert, Martina Navratilova, Steffi Graf, to reach all four Grand Slam finals in a calendar year.

2016 French Open – Women's Singles: Serena Williams was the defending champion, but lost in the final to Garbiñe Muguruza, 5–7, 4–6.  Williams was attempting, for the third time, to equal Steffi Graf's Open Era record of 22 major singles titles.  She was also attempting to become only the second player, after Steffi Graf, to complete a quadruple Career Grand Slam.

Lindsay Davenport: Lindsay Ann Davenport Leach (born June 8, 1976) is an American former professional tennis player.  She was ranked World No. 1 on eight different occasions, for a total of 98 weeks.  Davenport is one of five women who have been the year-end World No. 1 at least four times (1998, 2001, 2004, and 2005) since 1975; the others are Chris Evert, Steffi Graf, Martina Navratilova and Serena Williams.  She has achieved the No. 1 ranking in doubles as well.

Chris Evert: Christine Marie Evert (born December 21, 1954), known as Chris Evert Lloyd from 1979 to 1987, is a former World No. 1 professional tennis player from the United States.  She won 18 Grand Slam singles championships and three doubles titles.  She was the year-ending World No. 1 singles player in 1974, 1975, 1976, 1977, 1978, 1980, and 1981.  Overall Evert won 157 singles championships and 32 doubles titles.

Steffi Graf: Stefanie Maria "Steffi" Graf (] ; born 14 June 1969) is a German former tennis player, who was ranked world No. 1 during her career.  Graf won 22 Grand Slam singles titles.  Her 22 singles titles put her second on the list of Major wins in the female competition since the introduction of the Open Era in 1968 and is third all-time behind Margaret Court (24) and Serena Williams (23).  In 1988, she became the first and only tennis player (male or female) to achieve the Golden Slam by winning all four Grand Slam singles titles and the Olympic gold medal in the same calendar year.  Furthermore, she is the only tennis player to have won each Grand Slam event at least four times.

1988 Australian Open – Women's Singles: Hana Mandlíková was the defending champion, but was defeated by Steffi Graf in the quarterfinals.  Graf ended up winning the tournament, defeating Chris Evert in the final, 6–1, 7–6.  This would be Chris Evert's 34 appearance in a Grand Slam final, an Open Era record, and her 6th final, Evert made the final in every Australian Open she played.  This was the first Grand Slam Final played under a roof.  There was an 1 hour and 23 minute delay to close the roof at 1-1 in the first set.  This was Graf's first step towards completing the first and so far only calendar year Golden Slam.

1997 Wimbledon Championships: The 1997 Wimbledon Championships was a tennis tournament played on :grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon in London in England.  It was the 111th edition of the Wimbledon Championships and were held from 23 June to 6 July 1997.  The championships saw the inauguration of a new No.1 Court, the third court to be named such in the club's history.  To commemorate the new stadium, all the three-time or more singles champions were invited to a ceremony marking the opening of the new court and were presented with a silver salver.  Ten of the thirteen surviving eligible champions attended: Louise Brough, Rod Laver, Margaret Court, Billie Jean King, John Newcombe, Chris Evert, Martina Navratilova, John McEnroe, Boris Becker and Pete Sampras.  The only surviving absentees were Maria Bueno and Björn Borg who declined to attend and Steffi Graf who was recovering from knee surgery and unable to be present.

Supporting paragraphs: Chris Evert Steffi Graf
Answer: Stefanie Maria "Steffi" Graf