A deadly force for Transvaal against lesser batsmen on matting during the late 1920s – by which time his bowling on these wickets had been developed into a fine art – in 1930–31 Nupen was, owing to the absence of South Africa's former captain Nummy Deane due to poor form, chosen to captain the Test team against England. He did so with considerable skill and accomplished the best bowling of his Test career. He took 5 for 63 and 6 for 87 in the First Test to give South Africa victory by 28 runs, and 3 for 148 and 6 for 46 in the drawn Fourth Test. However, Nupen was thought so badly of on turf pitches that he was left out of the Third and Fifth Tests, the first two ever played on turf in South Africa. He achieved his best-ever domestic figures the following year with 43 wickets for 434 runs (including 9 for 48 and 7 for 88 in the match against Griqualand West). In 28 Currie Cup matches for Transvaal he took 190 wickets at an average of 12.92, nine times taking 10 or more wickets in a match.
- "Buster Nupen". www.cricketarchive.com. Retrieved 17 January 2012.
- South Africa v England, Johannesburg, 1930–31 (I)
- South Africa v England, Johannesburg, 1930–31 (II)
- Transvaal v Griqualand West, 1931–32
- Obituary, Cricketer, April 1977, p. 69.