Jurgen Klopp's side unsurprisingly dominated possession of the ball, though Ralph Hassenhuttl's side still managed to create a number of chances for themselves throughout the game.
Gunn then saved well to deny Andy Robertson after neat build-up play, but Saints were handed a lifeline by Adrian with seven minutes remaining. We played against City, somebody was running on the pitch?
Che Adams later should have opened his Saints account with another header from Oriel Romeu's cross but nodded over the bar unmarked from 12 yards.
And the German said it was only right that Adrian made an error.
Ings chased down a passback and Adrian's high stock fell when he dallied on the ball, allowing the Southampton striker to close down his clearance and send it in to the back of the net. The former Liverpool man squandered another late chance from close range as Klopp's men escaped.
The fan slipped as he was grabbed by a security guard and collided with several Liverpool players. Two games into the season, they might hope to be more fluent.
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If Brown can find a similar helmet that was manufactured in the last 10 years, he should be safe for at least another season. With all of the drama behind him, Brown returned to camp on Tuesday afternoon, ready to go.
But after Firmino came off the bench for the start of the second half, he provided two assists for Mane to turn the tie around before Jorginho made it 2-2 with a penalty. Mane's goal was particularly key as Southampton were hammering on the door and he turned the match in the visitors' favour.
If Adrian doesn't recover, Lonergan will be start.
Georginio Wijnaldum of Liverpool competes for the ball with Danny Ings of Southampton and James Ward-Prowse of Southampton during the Premier League match between Southampton FC and Liverpool FC at St Mary's Stadium on August 17, 2019 in Southampton, United Kingdom.
The games keep coming thick and fast for Liverpool and Chelsea.
The biggest source of optimism for Klopp will undoubtedly be the second-half performance of Oxlade-Chamberlain, the injury-ravaged midfielder who started consecutive games for the first time in more than a year.
The incident took place in the second half as Liverpool led through Sadio Mane's fine opener in first-half stoppage time.