Question: Gabriela Sabatini and Patrick McEnroe, are professionals of which sports occupation?

Context paragraphs:
1996 US Open – Women's Singles: 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.  It was a rematch of the 1995 US Open final, where Graf defeated Seles in three sets.  It also marked the final time Seles and Graf would play each other at the US Open.  The 1996 U.S Open proved to be the last for Gabriela Sabatini, as she retired later that year.  Sabatini was twice a finalist at the U.S Open.  In the 1988 US Open final, Sabatini lost to Graf in three sets.  Two years later, at the 1990 US Open, Sabatini defeated Graf in two sets to win her only Grand Slam title.

2013 French Open – Legends Over 45 Doubles: John McEnroe and Patrick McEnroe were the defending champions, but Patrick McEnroe did not participate. <br>

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.

1990 US Open – Women's Singles: Steffi Graf was the two-time defending champion, but she was defeated in the final by her rival Gabriela Sabatini, in what was a rematch of the 1988 US Open final and the 1989 US Open top half semifinal.  It also proved to be the first and only time Sabatini would defeat Graf in Grand Slam competition.

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.

Gabriela Sabatini: Gabriela Beatriz Sabatini (] ; born 16 May 1970) is an Argentine former professional tennis player.  She was one of the leading players on the women's circuit in the late-1980s and early-1990s.  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.

Patrick McEnroe: Patrick John McEnroe (born July 1, 1966) is a former professional tennis player and the former captain of the United States Davis Cup team.

Donald Dell: Donald Dell (born June 17, 1938 in Savannah, Georgia, United States) is an attorney and was a professional tennis player, U.S. Davis Cup captain, and administrator.  Dell was one of the first professional sports agents, having represented professional tennis players Arthur Ashe, Stan Smith, Jimmy Connors, and Ivan Lendl during pro tennis' golden age (1975 to 1985).  He was also the founder of Professional Services (ProServ), one of the nation's first sports marketing firms established in 1970 with co-founder, Frank Craighill, a fellow law partner.  His younger brother, Dick, worked for ProServ managing US Open champion Gabriela Sabatini, and played Number One Singles for the University of Michigan.  He was Big Ten #1 Singles Champion in 1969.

1993 Paris Open – Doubles: John McEnroe and Patrick McEnroe were the defending champions.  John McEnroe did not participate this year.  Patrick McEnroe partnered Richey Reneberg, losing in the second round.

1988 Virginia Slims of Florida: The 1988 Virginia Slims of Florida was a women's tennis tournament played on outdoor hard courts at the Boca Raton Resort & Club in Boca Raton, Florida in the United States and was part of Tier II of the 1988 WTA Tour.  The tournament ran from March 7 through March 13, 1988.  Fourth-seeded Gabriela Sabatini won the singles title and earned $60,000 first-prize money, ending a 30-match winning streak by Steffi Graf.  It was Sabatini's first win over Graf after 11 previous defeats.

Supporting paragraphs: Gabriela Sabatini Patrick McEnroe
Answer: tennis player