He appeared in 20 first-class matches as a right-handed batsman.
He scored 864 runs, with one century: 124 against Hawke's Bay in 1908–09, when he batted for only 85 minutes, hit five sixes, and added 196 runs for the second wicket with Don Naughton.
[3][4] Blacklock's father, James Blacklock, played for Wellington from 1878 to 1883, and two of his uncles also played first-class cricket for Wellington.
Blacklock fought in the Boer War at the age of 17.
[5] He later worked as an accountant and secretary in the tanning firm of Hirst and Co. of Wellington.