Question: What do Jim Grabb and Tracy Austin have in common?

Context paragraphs:
Jean-Michel Pequery: Jean-Michel Péquery (born May 30, 1978) is a retired French professional tennis player.  During his career, he competed exclusively in Challengers and Futures tournaments, except for two showings (for two first-round losses) in the doubles main draw of ATP Tour-level tournaments.  One of these was to remain his sole appearance at a Grand Slam and came at the 1998 French Open when he alongside Julien Boutter received a wild card to compete in the doubles tournament.  They fell to Jim Grabb and David Macpherson 6–3, 7–6.

1989 Stockholm Open – Doubles: Kevin Curren and Jim Grabb were the defending champions but only Grabb competed that year with Patrick McEnroe.

Jim Grabb: Jim Grabb (born April 14, 1964) is an American former professional tennis player.  He was ranked the World No. 1 doubles player in 1989 and in 1993.  Grabb's best singles ranking was World No. 24, a ranking he achieved in February 1990.

1997 Grand Prix de Tennis de Lyon – Doubles: Jim Grabb and Richey Reneberg were the defending champions, but did not participate together this year.  Grabb partnered Wayne Black, losing in the first round.  Reneberg partnered Sjeng Schalken, losing in the first round.

1990 Newsweek Champions Cup – Doubles: Boris Becker and Jakob Hlasek were the defending champions, but Hlasek did not participate this year.  Becker partnered Guy Forget, and they won the title, defeating Jim Grabb and Patrick McEnroe 4–6, 6–4, 6–3 in the final.

Tracy Austin: Tracy Ann Austin Holt (born December 12, 1962) is an American former World No. 1 retired professional tennis player.  She won three Grand Slam titles, including the women's singles titles at the 1979 and 1981 US Opens, and the mixed doubles title at the Wimbledon Championships in 1980.  Additionally, she won the WTA Tour Championships in 1980 and the year-ending Toyota Championships in 1981, both in singles.  A series of injuries and a serious automobile accident cut short her career.  Since 1979, she has been the youngest US Open female singles champion in history, and she is the youngest inductee of all time at the International Tennis Hall of Fame.  Austin won singles titles on all playing surfaces: clay (both red clay and green clay), indoor carpet, grass, and hard courts.

1999 du Maurier Open – Men's Doubles: Martin Damm and Jim Grabb were the defending champions, but competed this year with different partners.  Damm teamed up with Max Mirnyi and lost in second round to Ellis Ferreira and Rick Leach, while Grabb teamed up with Goran Ivanišević and lost in quarterfinals also against Ferreira-Leach.

1994 Comcast U.S. Indoor – Doubles: Jim Grabb and Richey Reneberg were the defending champions, but Reneberg did not participate this year.  Grabb partnered Jared Palmer, finishing runner-up.

1996 Comcast U.S. Indoor – Doubles: Jim Grabb and Jonathan Stark were the defending champions but only Grabb competed that year with Richey Reneberg.

1992 Australian Indoor Championships – Doubles: Jim Grabb and Richey Reneberg were the defending champions but lost in the final 6–2, 6–3 to Patrick McEnroe and Jonathan Stark.

Supporting paragraphs: Jim Grabb Tracy Austin
Answer: professional tennis player