He currently holds the record for most doubles slam titles won by a wheelchair player in any division (men's, women's, and quads), with 26.

Reid was born able-bodied, claiming that he enjoyed a wide variety of sports as a kid including football and tennis.

However, at the age of 12, he contracted a rare neurological condition called transverse myelitis which left him paralyzed from the waist down.

[citation needed] When he was younger, Reid combined his training commitments with his studies and in 2009 he passed Highers in Maths, English and Biology after attending Hermitage Academy in Helensburgh, Argyll and Bute.

He beat Austrian world No 9 Martin Legner to win his last tournament of the season in December, the Prague Cup Czech Indoor.

At the 2016 Summer Paralympics Reid won the gold medal for the men's wheelchair singles tennis, beating fellow Briton Alfie Hewett in straight sets, 6–2, 6–1.

[11] Reid and Hewett won a fifth straight French Open in June with a 6-1 6–4 victory over second-seeded Japanese duo Takuya Miki and Tokito Oda in the final.

[12] At the 2024 Wimbledon Championships, Reid and Hewett won the doubles title for a sixth time, defeating Takuya Miki and Tokito Oda in the final, 6–4, 7–6(7–2).

Reid was appointed Member of the Order of the British Empire (MBE) in the 2017 New Year Honours for services to wheelchair tennis.

[15] Reid was appointed Officer of the Order of the British Empire (OBE) in the 2023 Birthday Honours for services to tennis.