Appropriate to mention Bob Blair, who only made double digits twice in his test career, the bloke with the lowest average of all these, at 6.75
His 64* ultimately proved fruitless as part of a poor NZ team who were defeated by an innings by England, including Trueman. However, it was more than double the score of any other Kiwi in that innings. His 26 however allowed NZ to draw against SA in a bowler dominated match, including Pollock.
He also has a book, movie and play about him, related to his career. Sadly, his wife had been killed in the Tangiwai railway disaster on Christmas Eve 1953. It had been announced that he would not take further part in the match, but as Bert Sutcliffe began to walk off the field after the 9th wicket fell, Blair showed up to bat and help him put on 33 runs for the last wicket.