Question: Who won more tennis major singles championships, Meredith McGrath or Virginia Ruzici?

Context paragraphs:
1983 Virginia Slims of Detroit: The 1983 Virginia Slims of Detroit was a women's tennis tournament played on indoor carpet courts at the Cobo Hall & Arena in Detroit, Michigan in the United States that was part of the 1983 Virginia Slims World Championship Series.  The tournament was held from October 3 through October 9, 1983.  Eighth-seeded Virginia Ruzici won the singles title and earned $28,000 first-prize money.

1994 Volkswagen Cup: The 1994 Volkswagen Cup was a tennis tournament played on grass courts at the Devonshire Park Lawn Tennis Club in Eastbourne in England that was part of Tier II of the 1994 WTA Tour.  The tournament was held from 13 June until 18 June 1994.  Unseeded Meredith McGrath won the singles title.

Fiorella Bonicelli: Fiorella Bonicelli (born 21 December 1951) is a retired professional tennis player from Uruguay.  During her career, she won the 1975 French Open mixed doubles title with Thomaz Koch.  She also won the 1976 French Open women's doubles title with Gail Lovera, defeating Kathleen Harter and Helga Niessen Masthoff 6–4, 1–6, 6–3.  At the Fed Cup, her singles record is 11–4, and doubles record 6–8.  During her career, she reached one Grand Slam singles quarterfinal, at the 1978 French Open, where she lost to Virginia Ruzici 6–7, 6–4, 6–8.

Virginia Ruzici: Virginia Ruzici (born 31 January 1955) is a former professional tennis player from Romania.  She won the 1978 French Open singles championship.

1978 French Open – Women's Singles: Virginia Ruzici defeated Mima Jaušovec 6–2, 6–2 in the final to win the Women's Singles tennis title at the 1978 French Open.

1982 U.S. Clay Court Championships: The 1982 U.S. Clay Court Championships was a men's Grand Prix and women's Toyota Series tennis tournament held in Indianapolis in the United States and played on outdoor clay courts.  It was the 14th edition of the tournament and was held from August 2 through August 8, 1982.  Fifth-seeded José Higueras and top-seeded Virginia Ruzici won the singles titles.

Meredith McGrath: Meredith McGrath (born April 28, 1971) is a former professional tennis player.  She was born in Midland, Michigan, USA and made her debut on the Women's Tennis Association tour in 1988.  In her eight-year professional career Meredith achieved career-high world rankings of #18 in singles and #4 in doubles.  She notched victories over such players as Martina Navratilova, Martina Hingis, Anna Kournikova, Jana Novotna, Arantxa Sanchez Vicario, and Gigi Fernandez.  The pinnacle of her career came in reaching the singles semi-finals and doubles finals at the 1996 Wimbledon Championships.  In the singles she defeated Mana Endo, Amanda Coetzer, Nancy Feber, Katarína Studeníková and Mary Joe Fernandez before losing to Arantxa Sánchez Vicario.  An injury the week prior to the 1996 Wimbledon Championships eventually ended her career.  Meredith won the 1995 U.S. Open Mixed Doubles Championship (she was runner-up in 1989) and was the runner-up in the 1994 Australian Open Doubles Championship.  Meredith won three WTA singles titles: Oklahoma City and Eastbourne in 1994 and Birmingham in 1996, 25 doubles titles.  She retired with a 140–83 record in singles and a 189–40 record in doubles.  Meredith was recognized by Tennis Magazine as the WTA Comeback Player of the Year as she overcame near career-ending injuries to having her most successful competitive season in 1996.  In 1994 she received the WTA Tour Comeback Player of the Year.

1978 BMW Challenge: The 1978 BMW Challenge was a women's singles tennis tournament played on indoor carpet courts at the Brighton Centre in Brighton in England.  The event was part of the AA category of the 1978 Colgate Series.  It was the inaugural edition of the tournament and was held from 16 October through 22 October 1978.  Fifth-seeded Virginia Ruzici won the singles title and earned $14,000 first-prize money.

1980 French Open – Women's Singles: Chris Evert defeated Virginia Ruzici 6–0, 6–3 in the final to win the Women's Singles tennis title at the 1980 French Open.

1980 Austrian Open (tennis): The 1980 Austrian Open , also known as the 1980 Head Cup for sponsorship reasons, was a combine men's and women's tennis tournament played on outdoor clay courts.  It was categorized as a two-star tournament and was part of the 1980 Volvo Grand Prix circuit.  It took place at the Tennis Stadium Kitzbühel in Kitzbühel, Austria and was held from 21 July through 27 July 1980.  First-seeded Guillermo Vilas won the men's singles title and the accompanying $13,000 first-prize money while Virginia Ruzici won the women's singles event.

Supporting paragraphs: Meredith McGrath Virginia Ruzici
Answer: Virginia Ruzici