Barca only needed a draw to seal their seventh title in the past 10 years and they made a ideal start when record signing Philippe Coutinho scored with a stylish finish before Messi doubled the lead by volleying home a Luis Suarez cross.
Barca doubled their lead in style in the 38th minute when Suarez lofted an exquisite outside-of-the-boot pass in the path of the onrushing Messi to side-foot home on the volley.
"I feel very happy because, in the end, the league is very long, it starts in August, and when spring arrives everything is decided, we have passed everything".More news: Stanley Cup Playoffs 2018: Golden Knights vs
MANCHESTER (AP) - Arsene Wenger endured more agony at Old Trafford as his depleted Arsenal side conceded an injury-time goal by Marouane Fellaini to lose 2-1 to Manchester United in the Premier League on Sunday.
As arch-rivals Real Madrid continue their bid for a record-extending 13th Champions League title, Barca fans are left pondering what might have been had their turbulent season gone differently.
The Argentine superstar reached the milestone for the 2017-18 season by scoring a hat-trick at the Riazor as Ernesto Valverde's wrapped up the title with a 4-2 win.More news: Thousands of balloons released in lovely tribute to Alfie Evans
"Win once, we all have moments when we win once", he told Movistar.
The first "Clasico" of the season was always going to be a massive occasion, even if a struggling Real Madrid side were not proving to be Barca's closest rivals at the top of the table.
But with Messi in form, Barcelona certainly won't be overawed.
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Valencia, winless in four matches, has an 11-point lead over fifth-place Real Betis, which has four games left and hosts last-place Malaga on Monday. As you can imagine it was something that had to be sorted out to enable him to travel around, the World Cup, and also for any trip that family might want to take in the next few weeks.