|Batting style||Left-hand bat|
|Bowling style||Right-arm medium|
Marx was educated at Malvern College in England. He created a world record that stood for 73 years when he scored 240 on his first-class debut, for Transvaal against Griqualand West at Johannesburg in December 1920. Opening the batting, he hit 39 fours and a six, and took only 225 minutes. By the end of the first day, 16 December, Transvaal had dismissed Griqualand West for 141 after declaring at 457 for 9: 598 runs for 19 wickets off 121.3 six-ball overs in a day's play. In the next three matches he opened both batting and bowling, hitting another century against Orange Free State (on an opening day that yielded 645 runs for 16 wickets) and taking 7 wickets at 25.42.
When the Australians toured the next season he made 65 (the top score) against them for Transvaal, batting at number six, and was picked for the three Tests. Batting in the middle order and opening the bowling, he was only moderately successful, his best match being the Second Test, in which he made 36 and 34 and took three wickets.
He played one more match for Transvaal in December 1921. His first-class cricket career, which lasted just over 12 months, ended when he went to work on the mines of the East Rand and the mine manager refused to give him time off to play first-class cricket.
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