Alexander-Arnold's 12 Premier League assists in 2018-19 was the highest amount ever recorded by a defender in a single campaign.
Robertson's tally was one fewer than his fellow full-back, making it the first time in Premier League history that two defenders from the same team have each registered double-digit assists in a season.
Their output – defensively and offensively – helped Jürgen Klopp's side deliver the third-highest points total in top-flight history and produce a league-high 21 clean sheets.
The duo's willingness to contribute in the final third was also fuelled by the desire to emerge the winner of a light-hearted assist battle.