|British Empire Games|
|1938 Sydney||4×110 yards|
His eldest brother, Russell Henry Watson (1893–1941), was an Australian amateur middle distance champion, who held titles in the mile, half-mile, and 440 hurdles. Both Alf and his older brother, Edward, attended Caulfield Grammar School from 1917 to 1919.
Alf then attended Ivanhoe Grammar School, for whom he sprinted and competed in the high jump; As well as being a fine Australian Rules footballer (a member of the school's First XVIII from 1922 to 1924), he also played cricket with the school's First XI from 1921 to 1924, captaining the team in 1923 and 1924, and winning the Associated Grammar Schools' batting average in 1924 (as a consequence of which he was awarded a junior membership of the Melbourne Cricket Club).
At the 1938 Empire Games he was a member of the Australian relay team which won the bronze medal in the 4×110 yards competition. In the 440 yards hurdles contest he finished fourth.
He announced his retirement from competitive athletics in November 1938.
- Former Champion Runner Dead, The Mercury, (Monday, 17 November 1941), p.7.
- Webber, (1981), p.319; Wilkinson, (1997), pp.56, 58.
- Notes from Classroom and Playing Field: Olympic Representative, The Argus, (Thursday, 14 May 1936), p.7.
- School Sports: Associated Grammar Schools, The Argus, (Saturday, 4 November 1922), p.21. and Associated Grammar Sports on M.C.C. Ground: A. Watson (Ivanhoe Grammar) in the high jump for boys under 16, The Argus, (Tuesday, 14 November 1922), p.7. and Grammar Schools' Sports, The Argus, (Tuesday, 14 November 1922), p.4.
- "Referee", "Australia's Olympic Hope: Watson is Probable World Beater", The Sporting Globe, (Saturday, 6 April 1929), p.4.
- 1,500 Will Compete, The Argus, (Friday, 4 November 1938), p.19.
- Wilkinson, Ian R. (1997). The Fields At Play - 115 Years of Sport at Caulfield Grammar School 1881-1996. Playright Publishing. ISBN 0-949853-60-7.
- Webber, Horace (1981). Years May Pass On... Caulfield Grammar School, 1881-1981. Centenary Committee, Caulfield Grammar School, (East St Kilda). ISBN 0-9594242-0-2.
- Profile at Sports-Reference.com
- Profile at Athletics Australia
- Taylor, P., "These Days of Sport: Master of Style", The Argus, (Saturday, 7 March 1936), p.26.
- Hillhouse, A., "Story of Alf Watson: Brilliant Athlete for Twenty Years, The Junior Argus, (Thursday, 26 March 1936), p.7.
- Australia's Champions: A.J. Watson, The Sydney Morning Herald, (Friday, 27 March 1936), p.15.
- Olympic Hurdler's Success, The Argus, (Monday, 23 November 1936), p.7. and Yates's Good Time for 100 Yards Run, The Argus, (Monday, 23 November 1936), p.7.
- Sports Flashes from Many Fields: Hurdles Champion, The Canberra Times, (Monday, 13 September 1937), p.3.