The left-back and right-back lined up on either side of the defence in each of Liverpool’s opening seven matches of the season – all of which were won.
Robertson has claimed three assists so far this term while Alexander-Arnold opened his account, despite protestations from his teammate, with the corner delivery for Joel Matip’s headed goal against Southampton.
“But that should be half!” Robertson told Liverpoolfc.com with a grin. “It’s from a dead ball, a corner-kick. We’ve had that argument but I think I’ll give him his point. I’m 3-1 ahead, which is always nice.”
The friendly duel should be beneficial to Liverpool collectively, however, with the pair aware of the responsibility to be positive influences at each end of the pitch.
“We’re both just hungry to contribute, defensively first and foremost – we want to keep clean sheets. But going forward, we want to chip in with goals and assists,” added Robertson.
“Last season, we had a small competition. It started a bit later in the season. This season, we decided to have a competition and see who comes out on top at the end.
“He’s a fantastic player so I’m sure it’ll be tight; if I keep up with him with his assists then I’m sure we’ll both have a good season.”
Trent and Robbo's Premier League stats this season
Robertson’s continuing outstanding form into the new campaign has coincided with another fan song featuring his name becoming a regular during matches.
“And Andy Robbo!” goes the final refrain of a ditty built around summer signing Naby Keita.
The No.26 takes pride in the latest tribute – but insists the tune does not belong to him.
“Naby’s song is quite good once it gets going. The Kop are loving it. To have a part at the end when they shout it is quite nice,” added Robertson.
“They’ve tried to fit in the whole squad near enough – there are four or five of us in it. It’s always nice when the fans sing your name, of course. But that song is all about Naby, I’ll give him the credit for that.”