Question: Who won one women's grand slam singles title at the US Open in 1990, Brian Gottfried or Gabriela Sabatini?

<P0-S0>  The right-hander was the runner-up at the 1977 French Open and achieved a career-high singles ranking on the ATP tour on June 19, 1977, when he became World No. 3. <P0-S1> Brian Edward Gottfried (born January 27, 1952) is a retired tennis player from the United States who won 25 singles titles and 54 doubles titles during his professional career. <SEP> <P1-S0> Steffi Graf successfully defended her tile, defeating Monica Seles 7–5, 6–4 in the final to win the Women's Singles title at the 1996 US Open. <P1-S1>  It was a rematch of the 1995 US Open final, where Graf defeated Seles in three sets. <P1-S2>  It also marked the final time Seles and Graf would play each other at the US Open. <P1-S3>  The 1996 U.S Open proved to be the last for Gabriela Sabatini, as she retired later that year. <P1-S4>  Sabatini was twice a finalist at the U.S Open. <P1-S5>  In the 1988 US Open final, Sabatini lost to Graf in three sets. <P1-S6>  Two years later, at the 1990 US Open, Sabatini defeated Graf in two sets to win her only Grand Slam title. <SEP> <P2-S0>  She was one of the leading players on the women's circuit in the late-1980s and early-1990s. <P2-S1> Gabriela Beatriz Sabatini (] ; born 16 May 1970) is an Argentine former professional tennis player. <P2-S2>  She won one women's grand slam singles title at the US Open in 1990, the women's grand slam doubles title at Wimbledon in 1988, two WTA Tour Championships titles in 1988 and 1994, and a silver medal at the 1988 Olympic Games in Seoul. <SEP> <P3-S0> The Williams sisters are two professional American tennis players: Venus Williams (b. 1980), a seven-time Grand Slam title winner (singles), and Serena Williams (b. 1981), twenty-three-time Grand Slam title winner (singles), both of whom were coached from an early age by their parents Richard Williams and Oracene Price. <P3-S1>  There is a noted professional rivalry between them – between the 2001 US Open and the 2017 Australian Open tournaments, they met in nine Grand Slam singles finals. <P3-S2>  They became the first two players, female or male, to play in 4 consecutive grand slam singles finals from the 2002 French Open to the 2003 Australian Open; Serena famously won all 4 to complete the first of two "Serena Slams". <P3-S3>  Between 2000 and 2016, a 17-year span, they collectively won 12 Wimbledon singles titles (Venus won 5 and Serena won 7). <P3-S4>  By winning the 2001 Australian Open women's doubles title, they became the 5th pair to complete the Career Doubles Grand Slam and the only pair to complete the Career Doubles Golden Slam. <P3-S5>  At the time, Venus and Serena were only 20 and 19 years old, respectively. <P3-S6>  Since then they have gone on to add another two Olympic gold medals in the 2008 Beijing Olympics and the 2012 London Olympics. <P3-S7>  Nearly a decade later, the duo would go on to win 4 consecutive grand slam doubles titles from 2009 Wimbledon through 2010 Roland Garros, which would catapult them to co-No. <P3-S8>  1 doubles players on 7 June 2010. <P3-S9>  Two weeks later, on 21 June 2010, Serena would hold the No. 1 singles ranking and Venus would be right behind her at No. 2 in singles. <P3-S10>  Their most recent grand slam doubles titles came at the 2012 Wimbledon & 2016 Wimbledon events. <P3-S11>  They remain very close, often watching each other's matches in support, even after one of them has been knocked out of a tournament.