The game against Manchester City on Sunday evening has been revealed as the biggest ever TV audience to watch a Premier League match in the UK.
The BBC has reported that Saints 1-0 win over Manchester City on the BBC on Sunday became the Premier League's most-watched televised match, with an audience of 5.7 million.
The peak audience across all platforms saw the Saints record a surprise victory over last season's champions thanks to Che Adams' superb strike.
Steve Rudge, BBC lead executive, football, said:
"Having the Premier League has been great for our viewers.
"We were delighted to deliver this game to the widest free-to-air audience."
The global power of the Premier League may mean that this is not the biggest World Wide audience, but it certainly is in the UK and a great bit of news for Saints supporters that the teams magnificent fighting performance was seen by so many across the country.