Messi who is now captain of the side scored two goals while Phillipe Coutinho added another to give the reigning La Liga champions a winning start to the season.
In the game against Alaves by scoring Messi set two new records for the Catalan giants as they kicked off their season.
Messi scores Barcelona's 6,000th La Liga goal
Lionel Messi's first record on the night was that he scored what turned out to be Barcelona's 6,000th goal in the Spanish top division.
Coutinho scored Barcelona's 5999th in the last La Liga game of 2017/18 season in a 1-0 win against Real Socieded.
It meant that whoever opened the scoring for Barcelona in the new season will put his name in the club's history books for the 6,000th goal.
After a frustrating first half for Barcelona, Messi stepped up to convert a calmly taken free kick under the wall Alaves to put Barcelona ahead to show that he has return to form after the .
Messi previously scored Barcelona's 5,000th goal in La Liga against in February 2009.
He joins Manuel Parera who scored Barcelona's first goal in 1929 , Marcos Aurelio who scored the 1000th goal in 1950, Pedro Tomás Zaballa who scored the 2000th goal in 1964, Quini who scored the 3000th goal in 1982 and Guillermo Amor who scored the 4000th goal in 1996.
Barcelona are still however behind Real Madrid in total goals scored in La Liga as the y have a total of 6041.
Messi scores in 15th La Liga season
Lionel Messi's other record in the game against Alaves was that he has now scored in the 15th straight La Liga season for Barcelona.
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The result meant that since his goal in the 2004/05 season against Albacete , Messi has never failed to find the back of the net in a season.
Messi and his Barcelona teammates continue their La Liga defensewhen they travel to face Real Valladolid in their next fixture.