Thom de Boer swam the Olympic limit and a Dutch record for the 50 meter freestyle at the Rotterdam Qualification Meet (RQM) on Thursday.
The 28-year-old North Hollander reached a time of 21.74 in the series.
With that he dipped 0.08 seconds below the national top time that had been held by Jesse Puts since December 2016.
De Utrecht tapped in 21.82 four years ago.
The Olympic limit on the 50-meter freestyle is 21.91, a time that Puts already swam at the World Cup in the summer of 2019.
In the series in Rotterdam, De Boer was the only swimmer to hit in less than 22 seconds.
The final on the 50 free is scheduled for later on Thursday.
On the 50-meter breaststroke Arno Kamminga set the Dutch record that was already in his hands.
The Katwijker reached a time of 26.88 in Rotterdam, which made him slightly faster than a year ago in Amsterdam (26.90).
The 50 meter breaststroke is not an Olympic number.
Thom de Boer swam on the first day of the RQM to an Olympic limit and a Dutch record in the 50 meters free. (Photo: ANP)
Thom de Boer swam on the first day of the RQM to an Olympic limit and a Dutch record in the 50 meters free.
Heemskerk is missing in Rotterdam
Swimmers hope to get a ticket for the Olympic Games and the European Long Course Championships (May 2021 in Budapest) at the RQM in Rotterdam.
After this tournament, the maximum two fastest athletes per number will be nominated for the Games.
Open spaces can then be occupied by swimming a limit at the Swim Cup in Eindhoven (April) or the European Championship.
A number of Dutch top swimmers, including Kamminga, already swam one or more Olympic limits before it was known that the Games were postponed to 2021.
Their tickets can only be jeopardized if there are Dutch people in Rotterdam who swim a faster time on the relevant numbers.
Femke Heemskerk is one of the swimmers who would defend her time in Rotterdam, but the born Roelofarendsveense cannot participate.
Her husband tested positive for the corona virus and therefore Heemskerk must also stay at home.
The RQM started on Thursday and will last until Sunday.
For the Dutch top swimmers it is the first major event on the long course in months.