Ajax won a 35th Dutch league title as Erik ten Hag watched his side beat Emmen 4-0 at the Johan Cruijff ArenA.
Their last Eredivisie triumph came on Sunday as Ajax scored twice in the league and in the cup.
It came just two days after head coach Ten Hag signed a new two-year contract with the club, amid reported interest from Tottenham.
Goals from Jurrien Timber, Sebastien Haller, Devyne Rensch and Davy Klaassen saw the Amsterdam giants take a landslide victory.
– AFC Ajax (@AFCAjax) May 2, 2021
The result brought them to 79 points in 31 games, with second-placed PSV no longer able to catch up with their big rivals.
Ajax also won the KNVB Beker – the Dutch Cup – by beating Vitesse 2-1 in the final two weeks ago.
Last season’s Eredivisie was dropped due to the COVID-19 pandemic, with Ajax level on points with AZ Alkmaar at the top after 25 games, and no champions have been crowned.
They have dominated this campaign, losing just two games so far, with three full rounds of games remaining.
Only twice before have they clinched the title with at least three rounds to go, as before in the 1971-72 and 1997-98 campaigns.
– OptaJohan (@OptaJohan) May 2, 2021