|Date of birth||27 June 1991|
|Place of birth||Hillingdon, England|
|Height||1.78 m (5 ft 10 in)|
|Weight||86 kg (13 st 8 lb; 190 lb)|
|School||St George's College, Weybridge|
|Notable relative(s)||Anthony Watson (brother) Mark Watson (Concorde Pilot) (Uncle)|
|Rugby union career|
He attended St George's College, Weybridge in Surrey, as a full-back.
Watson never made a competitive first team appearance for Saracens but did help them win the JP Morgan Premiership Sevens.
Watson transitioned back to 15-a-side when he signed with Newcastle Falcons after three years with England Sevens in February 2015. He was awarded the team's player of the month in November 2017. On 22 February 2017, Watson signed for Premiership rivals Wasps ahead of the 2017-18 season.
He played for England in the World Rugby Under 20 Championship in 2010. Marcus played for England national rugby sevens team from 2012–2015. He was selected for Team GB's Rugby 7s squad to play at the Rio Olympic Games 2016  in which GB won silver.
- "Falcons move".
- "Wasps sign Newcastle Falcons winger Marcus Watson". BBC Sport. 22 February 2017. Retrieved 7 April 2017.
- "Marcus Watson, Ollie Lindsay-Hague confirmed for Team GB's Rugby 7s squad Rugby 7s to play at the Rio Olympics Games 2016". www.premiershiprugby.com. Retrieved 9 August 2016.
- "Rio Olympics 2016: Silver for GB as Fiji win sevens gold". www.bbc.co.uk. Retrieved 12 August 2016.