Firmino almost set the tone after 45 seconds with a goal that was disallowed when Sadio Mane was ruled to be offside, and though Michel Vorm parried away an attempt by Mohamed Salah after 22 minutes, Liverpool struck first behind Wijnaldum.
Liverpool boss Jurgen Klopp had been concerned about Firmino when he spoke to the media immediately after the Spurs game.
"Tottenham won't be happy but because we were so good, it was hard for them".More news: Florence disaster declared in North Carolina as flooding threat grows
"Now we have to prove it and do it again, again and again". Yes, we learned, the experience was that one game can be completely different to another.
"A good pre-season should be at least three or four weeks", said Klopp. Back when everyone largely played 4-4-2 and there was none of this play-it-out-from-the-back malarkey, Joe Cole was dumped out there a lot and Steven Gerrard was wasted in too many games. "They won yesterday without Neymar and [Kylian] Mbappe so they could rest players in the league, but that's Tuesday".
Against Liverpool, he was substituted in the 73rd minute for Son, the South Korean making his first return since winning the recent Asian Games.
Liverpool released a statement on Saturday evening confirming Firmino was discharged from a London hospital after receiving positive news on the eye injury. "We have to think about the game tomorrow, then we see who we can choose for the next game".More news: Oil slips from four-month highs on economic concerns
"From my point it is all fine, but I know the situation isn't what some people expected but I can not change that".
"But it's something with the eye and for sure at the moment it's not comfortable for him".
The 26-year-old Brazilian came off after 74 minutes after a clash with Spurs defender Jan Vertonghen.
The next challenge is in the Champions League with a trip to Inter Milan on Tuesday when Liverpool hosts Paris Saint-Germain at the start of the group stage.More news: BMW’s Self-Driving Motorcycle Could Help Keep Bikers Safe
"A hospital examination confirmed an abrasion of the eye, but there will be no lasting damage".