Martin Sayer
Country (sports) Hong Kong
Born (1987-06-20) June 20, 1987 (age 36)
Died2023
PlaysRight-handed
Singles
Career record8–3 (Davis Cup)
Highest rankingNo. 1303 (October 4, 2004)
Doubles
Career record7–2 (Davis Cup)
Highest rankingNo. 1336 (August 22, 2005)

Martin Christopher Sayer (Chinese: 施馬田, June 20, 1987-July 25, 2023) is a Hong Kong tennis player. He is 1.85m and weighs 89 kg. Sayer is and has been a member of the Hong Kong Davis Cup team, compiling a 15-3 record in Davis Cup action since 2005.

Sayer studied and received his BSc and MBA from Radford University, Virginia and competed in NCAA competitions during the 2005-09 period. In the 2008-09 Season, Sayer reached 100 wins in singles on February 8, 2009 and he won the NCAA Men's Division I Big South Conference Player of the Year Award for three consecutive years, from 2006 to 2008.

From the Davis Cup official website, Sayer and Brian Hung are the most successful doubles team in the Davis Cup of Hong Kong. They competed in a 4-1 win-loss result. On March 8, 2009, Sayer played against Cecil Mamiit of the Philippines in the Davis Cup Asia/Oceania Group II first round. Mamiit won the match 6-4 4-6 3-6 7-6 9-7, the 58 games making it the longest match in the history of the Hong Kong Davis Cup team.

Martin Sayer was member of the "dream team" at Radford University