Classy from Luis Suarez, who beats a couple of players in the middle of the park and then plays the ball wide.
As the ball comes back in the Uruguayan elects to dummy the ball to his teammate Benjamin Cremaschi but the American drags his effort and it is easily saved by Porto keeper Claudio Ramos.
Lionel Messi comes deep and tries to set off another Inter Miami attack, this time though there is very little movement ahead of him.Lionel Messi #10 of Inter Miami CF reacts
Inter Miami have made a decent fist of things since going a goal behind. You do have to wonder just how much pressure they can put on Porto the longer this game wears on, given the ageing legs of their star players.
Lionel Messi has been the best player by a country mile so far. He drives down the middle of the pitch and just as it looks as though he is about to be caught he plays in Luis Suarez.
Porto keeper Claudio Ramos is out quickly though and blocks Suarez's attempt to dink the ball over him.
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All that’s wrong with VAR with that penalty. Why in football can we not sort out our rules. You can rugby tackle opponents pretty much from set-pieces, but you breathe on someone and it’s a penalty. Different rules, for different areas of the box. Nonsense.
Inter Miami midfielder Benjamín Cremaschi gets into a promising position down the right but then completely shanks his cross out of play. Woeful from the US international.
Lionel Messi has scored 754 times across all competitions during his senior domestic career
ByBobbie Jackson
BBC Sport Journalist
Lionel Messi scored his 50th goal for Inter Miami as they came from behind to beat Porto for their first win at the Fifa Club World Cup.
Porto took the lead after just eight minutes when Samu Aghehowa squeezed a penalty under the arm of goalkeeper Oscar Ustari.
Martin Anselmi's side could have been further clear by half-time but Francesco Moura saw a shot cleared off the line and Alan Varela struck the post.
Telasco Segovia sparked the Inter Miami comeback when powering Marcelo Weigandt's cut-back into the top corner.
Messi then sealed the MLS franchise's maiden victory in the competition with a trademark free-kick over the wall and out of reach for a sprawling Claudio Ramos.
The 37-year-old fired wide from a set-piece further out just a few moments prior but, when presented with another opportunity centrally and from the edge of the D, he executed perfectly to score his 68th goal from a direct free-kick.
He was fresh from 21 goals in 41 games for Paris St-Germain in 2022-23 and moving to MLS, where the level of competition is not that of Europe's big five leagues.
However, Messi, who has scored 50 goals in 61 appearances for Inter Miami, showed the world he still has plenty left in the tank to dazzle the crowds when up against strong European opposition.
Messi's sixth goal in the competition means he is joint-second on the Club World Cup all-time goalscorers list - level with Gareth Bale and Karim Benzema - and just one shy of leader Cristiano Ronaldo (7).
Who stood out and who did not?
Sergio Busquets might be just a month shy of his 37th birthday but he remains a hugely influential player in the middle third.
The three-time Club World Cup winner put in a domineering performance against midfielders more than 10 years his junior.
Only team-mate Benjamin Cremaschi (5) made more successful tackles than Busquets (3), while Porto's Fabio Vieira (80) was the only player to attempt more than his 74 passes.
Busquets also ended the game with a 94.5% pass completion rate.
Messi continued his fine goalscoring record in the Fifa Club World Cup, having now scored six times in seven appearances.
The Argentina international registered on five occasions for Barcelona, including one in each of the three finals he played in - winning the competition in 2009, 2011 and 2015.
What's next for these teams?
The final round of fixtures in Group A all kick-off at the same time (02:00 BST) on Tuesday.
Second-placed Inter Miami take on group leaders Palmeiras, in Florida, while Porto travel to New Jersey to face Egyptian side Al Ahly.
A draw will be enough to send Inter Miami and Palmeiras, who both have four points, through to the last 16.
Porto have just one point to their name and can only reach the knockout phase if they win and one of the teams in the other match loses.