Cahill's header made 2-1 before Costa nodded in and scored a well-taken second. And in stoppage time, former Chelsea player Ryan Bertrand scored a fine header for the Saints.
Leicester City have been impressive this season under Brendan Rodgers and they are still occupying second position on the standings after beating Brighton.
"Leicester have always been a team that bookies are wary of after their 5,000-1 Premier League winning season. "There's a lot of confidence around Leicester, they're the in-form team.
Paris Saints-Germain superstar, Neymar could leave the club for Manchester United this summer after the French Ligue 1 champions offered Manchester United the chance to sign him.
Guardiola's men beat the Saints 6-1 on Sunday, to return to the top of the table, but the Spaniard was still not totally happy with his team's performance. "We played excellently, without and especially with the ball," he told BBC Sport.
The championships in the Premier League, Spain and Germany resume this weekend The arrival of Lionel Messi - and not only him - attracted all the spotlight on Paris Saint-Germain, but as the Saints will essentially have no competition in the
"They are not sinners, two of them are members of the Church! They said, 'Since we eat food, this one too'! Please 1 Corinthians 7:5, let's close! All the married people read this Scripture!
"Unai Emery's side starts the day eight points off fourth place in the table and I think this is a must-win game for the Gunners' boss given Saints sit just one point and one place off the foot of the table."
Cardiff City The Bluebirds are in for tough season, that's for sure, but seem keen to adapt to their rivals. They played a 4-1-4-1 with Sol Bamba in defensive midfield but drop deep and narrow on almost every possible occasion.
In January 2023, Onuachu completed a transfer to English club Southampton on a three-and-a-half-year contract on deadline day. However, the towering forward could not help the Saints avoid relegation in his debut season.
More teams will join the fray after falling out of the Champions League and Europa League later in the year. The winner of the tournament will book a spot in the following season's Europa League.