Question: John Peers and Jared Palmer, have which occupation in common?

Context paragraphs:
2016 German Open – Doubles: Jamie Murray and John Peers were the defending champions, but Murray chose to participate in the Davis Cup quarterfinals instead.  Peers played alongside Henri Kontinen and successfully defended the title, defeating Daniel Nestor and Aisam-ul-Haq Qureshi in the final, 7–5, 6–3.

Jared Palmer: Jared Eiseley Palmer (born July 2, 1971) is a professional tennis player who won 28 professional doubles titles and one singles title in his career on the ATP Tour.  He also won four double titles on the challenger's circuit (two in 1992 and two in 1993).  Palmer turned professional in 1991 after winning the 1991 NCAA Division 1 singles title as a sophomore playing for Stanford University.

2016 Brisbane International – Men's Doubles: Jamie Murray and John Peers were the defending champions, but Murray chose to compete in Doha instead.  Peers played alongside Henri Kontinen and successfully defended his title, defeating James Duckworth and Chris Guccione in the final, 7–6, 6–1.

2001 Franklin Templeton Classic – Doubles: Jared Palmer and Richey Reneberg were the defending champions but only Palmer competed that year with Donald Johnson.

2001 Indian Wells Masters – Men's Doubles: Alex O'Brien and Jared Palmer were the defending champions but they competed with different partners that year, O'Brien with Sébastien Lareau and Palmer with Byron Black.

1999 Kremlin Cup – Men's Doubles: Jared Palmer and Jeff Tarango were the defending champions, but Palmer did not participate this year.  Tarango partnered Yevgeny Kafelnikov, losing in the first round.

2014 Aegon Trophy – Men's Doubles: Jamie Murray and John Peers were the defending champions, but decided not to compete.

2015 Wimbledon Championships – Men's Doubles: Vasek Pospisil and Jack Sock were the defending champions, but lost in the third round to Jamie Murray and John Peers.  Jean-Julien Rojer and Horia Tecău won the title by defeating Murray and Peers in the final by a score of 7–6, 6–4, 6–4.

2014 Aegon Championships – Doubles: Bob and Mike Bryan were the defending champions, but lost in the second round to Jamie Murray and John Peers. <br>

John Peers: John William Peers (born 25 July 1988) is an Australian professional tennis player who competed mainly on the ATP Challenger Tour both in singles and doubles until 2013, when he began to focus solely on doubles and began competing on the ATP World Tour.

Supporting paragraphs: John Peers Jared Palmer
Answer: professional tennis player