Just five minutes later and it was two though, with skipper Jordan Henderson the architect of a brilliantly simple team goal.
"We knew we had to play the second game and we can not decide the tie tonight, so now we have to go there and fight again".
This time Jurgen Klopp deployed him in a slightly more advanced position, allowing him to play with more freedom going forward.
"It would be cool if I could ask a player to please play these kind of passes, and we score immediately!" said the German.
Owen was impressed with the manner of Liverpool's display and does not believe there is a team in Europe who would beat them at Anfield now.
Salah was lucky not to be shown a red card for an ugly challenge on Danilo Pereira in the closing stages as Porto - who again came close through Marega - ultimately fell short of finding an away goal that would have changed the complexion of next week's second leg.
"Second half we lost a little bit of rhythm and direction".
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With the away-goals rule, by which the Portuguese side beat Roma in the previous round, the Reds will be grateful they are 2-0 up rather than 3-1 or 4-2 ahead, which might have reflected a slightly chaotic match more accurately.
Their team-mate Trent Alexander-Arnold narrowly missed out at right-back, with Crystal Palace's Aaron Wan-Bissaka receiving one more vote after a breakthrough campaign at the London club.
The opener helped Liverpool settle into the match and begin seeing the lion's share of possession, although Porto were still a threat on the break and it took an important piece of covering defending from Virgil van Dijk to thwart a clear chance for Marega after 17 minutes.
He continued: "So until they start playing convincing, dominant football, which they haven't done with the exception of the Bayern Munich game, this year, I don't see them as having an easy ride to anything". Two-nil is a really, really good result, I would probably have taken that before the game and I'll take it now. But the 90 minutes are over and we've got another 90 minutes at the Dragao.
"And we have to give it our all away at their stadium". Together with Hendo there that was brilliant.
The striker - looking to become only the fourth player to score in seven successive Champions League games - drew one low stop from Alisson from a tight angle but then wasted a better chance when firing wide of the near post while ignoring an unmarked Otavinho in the middle. It never materialised and Klopp claimed the tie is far from over before next Wednesday's return at Estádio do Dragão.
"We wanted to be as good as possible tonight, and 2-0 is a fantastic result, with the clean sheet, what more could we want?"