[1] He made his highest score of 84 not out for Wellington against Canterbury in 1883–84, his first season, just days after his nineteenth birthday.
Wellington trailed by 114 on the first innings and were 62 for 5 at one stage in their second before Blacklock made the highest score of the match and ensured a draw.
"[3] He scored two fifties, top-scoring for Wellington in each innings, to defy Auckland and secure a draw in 1884–85.
[4] He also top-scored in Wellington's match against New South Wales in 1893–94, scoring 65 and adding 117 for the third wicket (out of an eventual team total of 180) with Alfred Holdship.
[5] He captained Wellington several times in the 1890s, and was a member of New Zealand's first victorious side when they beat New South Wales in 1895–96.