Question: What sport do both Jim Grabb and Michael Chang play?

Context paragraphs:
1996 Shanghai Open – Doubles: Mark Knowles and Roger Smith won in the final 4–6, 6–2, 7–6 against Jim Grabb and Michael Tebbutt.

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.

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.

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.

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

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.

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

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.

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.

Michael Chang: Michael Te-Pei Chang (born February 22, 1972) is a retired American professional tennis player.  He won 34 top-level professional singles titles, including the 1989 French Open when he was 17.  He also was a three-time runner-up at the majors and reached a career best ranking of world No. 2 in 1996.  Since he was shorter than virtually all of his opponents, he played a dogged defensive style utilizing his quickness and speed.  In 2008, he was inducted into the International Tennis Hall of Fame, and he has coached Kei Nishikori since 2014.

Supporting paragraphs: Jim Grabb Michael Chang
Answer: tennis