Question: Which tennis player ranked higher in singles, Fabio Fognini or Marty Riessen?

Context paragraphs:
1970 Rothmans International Tennis Tournament: The 1970 Rothmans International Tennis Tournament was a men's professional tennis tournament held on indoor carpet courts in the Royal Albert Hall in London, England.  It was the first edition of the tournament and was held from 4-7 March 1970.  It was an independent event, i.e. not part of either the 1970 Grand Prix or 1970 World Championship Tennis circuit.  Marty Riessen won both the singles and doubles competition and £2525 in prize money.

Fabio Fognini: Fabio Fognini (] ; born 24 May 1987) is an Italian professional tennis player who is currently ranked world No. 29 in men's singles by the Association of Tennis Professionals (ATP) and the current Italian No. 1.  His career-high singles ranking is world No. 13, achieved in March 2014, and world No. 7 in doubles, achieved in July 2015.  Fognini's most successful surface is red clay, upon which he won his four ATP singles titles in Stuttgart, Hamburg, Viña del Mar and Umag, reached the quarterfinals of the 2011 French Open and the semifinals of the 2013 Monte-Carlo Masters.  Together with Simone Bolelli, Fognini won the 2015 Australian Open doubles event, becoming the first all Italian men's pair to win a Grand Slam title in the Open era.

Paolo Lorenzi: Paolo Lorenzi (] ; born 15 December 1981 in Rome, Italy) is an Italian professional tennis player, and current Italian No. 2.  His career-high singles ranking is World No. 33.  Lorenzi is coached by Claudio Galoppini.  On August 1, 2016 he overtook Fabio Fognini becoming the new Italian #1 in the Association of Tennis Professionals ATP Ranking at the age of 34 years old and 8 months.

1972 Washington Star International: The 1972 Washington Star International was a men's tennis tournament that was played on outdoor clay courts at the Washington Tennis Stadium in Washington, D.C..  The event was part of the 1972 World Championship Tennis circuit.  It was the fourth edition of the tournament and was held from July 17 through July 23, 1972.  Tony Roche won the singles title after surviving a match point in the final against Marty Riessen.

1974 U.S. Pro Tennis Championships: The 1974 U.S. Pro Tennis Championships was a men's tennis tournament played on outdoor green clay courts (Har-Tru) at the Longwood Cricket Club in Boston, USA.  It was classified as a Group AA category tournament and was part of the 1974 Grand Prix circuit.  It was the 47th edition of the tournament and was held from August 20 through August 26, 1974.  Fourth-seeded Björn Borg won the singles title and the accompanying $16,000 first prize money.  En route to the final Borg survived match points in both his quarterfinal match against Marty Riessen as well as his semifinal match against Jan Kodeš.  With his victory Borg became the youngest winner of the US Pro Championships at 18 years and two months, surpassing title-holder Jimmy Connors who did not defend his title but instead elected to play the Eastern Grass Court Championship in preparation for the US Open.  After the final, which was watched by a crowd of almost 6,000, Okker commented ""This was the first time I've played Björn Borg and at the moment I'm hoping it will be the last!"" .

Adam Pavlásek: Adam Pavlásek (born 8 October 1994) is a tennis player playing on the ATP Challenger Tour from the Czech Republic.  He reached his career-high ATP singles ranking of World No. 72 in January 2017.  At the start of 2015, Pavlásek replaced injured countryman Radek Štěpánek in the Hopman Cup, playing alongside Lucie Šafářová.  He made a name for himself by defeating world number 20 Fabio Fognini of Italy, Pavlásek's first ever win over a top 20 player.

Simone Bolelli: Simone Bolelli (born 8 October 1985; ] ) is an Italian professional tennis player.  Bolelli is a Grand Slam champion since he won the 2015 Australian Open doubles event with Fabio Fognini, becoming the first all Italian men's pair to win a Grand Slam title in the Open Era.

Marty Riessen: Marty Riessen (born December 4, 1941) played amateur and professional tennis in the 1960s and 1970s.  He was ranked as high as No. 11 in the world in singles on the ATP Rankings in September 1974, though was ranked as high as World No. 8 by Lance Tingay of The Daily Telegraph in 1971, before the computer rankings.  Renowned for his doubles play, Riessen was also a regular doubles partner of Australian tennis great Margaret Court, winning six of his seven major mixed titles and a career grand slam alongside her.  Additionally a winner of two men's doubles grand slams, his highest doubles ranking was No. 3 on March 3, 1980.

1971 Aryamehr Cup: The 1971 Aryamehr Cup was a men's professional tennis tournament played on outdoor clay courts at the Imperial Country Club in Tehran in Iran.  The event was part of the 1971 World Championship Tennis circuit.  It was the first edition of the tournament and was held from 10 May through 16 May 1971.  Marty Riessen won the singles title.

Óscar Serrano (tennis): Óscar Serrano Gámez (born 25 May 1978, in Barcelona, Catalonia) is a former Spanish professional male tennis player.  Currently, as June 2010, Oscar Serrano is the coach of Fabio Fognini.

Supporting paragraphs: Fabio Fognini Marty Riessen
Answer: Marty Riessen