Question: The 1973 Virginia Slims of Boston was won by which retired Australian player?

Context paragraphs:
1973 Virginia Slims of Richmond: The 1973 Virginia Slims of Richmond was a women's tennis tournament played on indoor clay courts at the Westwood Racquet Club in Richmond, Virginia in the United States that was part of the 1973 Virginia Slims World Championship Series.  It was the second edition of the tournament and was held from March 14 through March 18, 1973.  First-seeded Margaret Court won the singles title and earned $6,000 first-prize money.

1973 Virginia Slims of Washington: The 1973 Virginia Slims of Washington was a women's tennis tournament played on indoor carpet courts at the Linden Hill Racquet Club in Bethesda, Maryland in the United States that was part of the 1973 Virginia Slims World Championship Series.  It was the second edition of the tournament and was held from January 29 through February 4, 1973.  First-seeded Margaret Court won the singles title and earned $10,000 first-prize money.

1973 Virginia Slims of Houston: The 1973 Virginia Slims of Houston was a women's tennis tournament played on indoor carpet courts at the Net-Set (West Side) Racquet Club in Houston, Texas in the United States that was part of the 1973 Virginia Slims World Championship Series.  It was the third edition of the tournament and was held from September 17 through September 24, 1973.  Unseeded Françoise Dürr won the singles title and earned $7,000 first-prize money.  The final was delayed by one day due to rain.

1973 Virginia Slims of Boston: The 1973 Virginia Slims of Boston, also known as the Virginia Slims Indoors, was a women's tennis tournament played on indoor carpet courts in Boston, Massachusetts in the United States that was part of the 1973 Virginia Slims World Championship Series.  The tournament was held from April 11 through April 15, 1973.  Margaret Court won the singles title after a 59-minute final against Billie Jean King and earned $6,000 first-prize money.

Margaret Court: Margaret Court {'1': ", '2': ", '3': ", '4': "} (née Smith; born 16 July 1942), also known as Margaret Smith Court, is a retired Australian tennis player and former world No. 1.  She is currently a Christian minister in Perth, Western Australia.  In tennis, she amassed more major titles than any other player in history.

1973 Virginia Slims of Denver: The 1973 Virginia Slims of Denver, also known by its sponsored name Denver Majestic Tournament, was a women's tennis tournament played on hard court at the South High School in Denver, Colorado in the United States that was part of the 1973 Virginia Slims World Championship Series.  It was the second edition of the tournament and was held from July 30 through August 5, 1973.  First-seeded Billie Jean King won the singles title and earned $7,000 first-prize money.  Total attendance for the event was 22,800 which made it the first women's-only tournament to have an attendance of more than 20,000.

1973 Virginia Slims Grass Court Championships: The 1973 Virginia Slims Grass Court Championships, also known as the Virginia Slims of Newport, was a women's tennis tournament played on outdoor grass courts at the Newport Casino in Newport, Rhode Island in the United States that was part of the 1973 Virginia Slims World Championship Series.  It was the third edition of the tournament and was held from August 20 through August 26, 1973.  First-seeded Margaret Court won the singles title and earned $7,000 first-prize money.

1973 Virginia Slims of Detroit: The 1973 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 1973 Virginia Slims World Championship Series.  It was the second edition of the tournament and was held from March 1 through March 4, 1973.  First-seeded Margaret Court won the singles title and earned $6,000 first-prize money.

1973 Virginia Slims of Chicago: The 1973 Virginia Slims of Chicago was a women's tennis tournament played on indoor carpet courts at the Lake Shore Racquet Club in Chicago, Illinois in the United States that was part of the 1973 Virginia Slims World Championship Series.  It was the second edition of the tournament and was held from March 8 through March 11, 1973.  First-seeded Margaret Court won the singles title and earned $6,500 first-prize money.

1973 Virginia Slims of Indianapolis: The 1973 Virginia Slims of Indianapolis was a women's tennis tournament played on indoor hardcourts at the Convention-Expo Center in Indianapolis, Indiana in the United States that was part of the 1973 Virginia Slims Circuit.  It was the second edition of the tournament and was held from February 22 through February 26, 1973.  Third-seeded Billie Jean King won the singles title and earned $6,000 first-prize money.  In the semifinal King, coming back from a three months break, saved three match points against Margaret Court and ended Court's 12-tournament 54-match winning streak.

Supporting paragraphs: 1973 Virginia Slims of Boston Margaret Court
Answer: Margaret Court