[citation needed] In the 2001 European Championship, van Kampen retired all five batters he faced as the Netherlands won Gold.

[citation needed] He only pitched once in the 2003 Baseball World Cup, tossing a scoreless inning and allowing one hit in an easy win and combined 2-hitter over the French national team.

[citation needed] He was back with the Dutch squad for the 2005 European Championship (hurling two games as the Netherlands won the Gold).

[citation needed] He had a 1.93 ERA in four appearances in the 2005 Baseball World Cup as the Dutch team finished 4th, their highest ever to that point.

He pitched in the 2006 World Baseball Classic as the lone Dutch pitcher to succeed in an 11–2 loss to the Cuban national team.

Van Kampen fanned Joan Carlos Pedroso before giving way to relief pitcher Nick Stuifbergen.

[citation needed] Van Kampen threw nine scoreless innings in the 2006 Intercontinental Cup to help the Netherlands win the silver medal.

[citation needed] Van Kampen pitched 32⁄3 scoreless innings for Kinheim in the 2007 European Cup, registering a save in the finals.

[citation needed] In the 2007 European Championship, van Kampen threw 31⁄3 scoreless innings, saving one game as the Netherlands won the Gold and qualified for the 2008 Summer Olympics.

[citation needed] In the quarterfinals, Van Kampen did far better, getting the win over the host Chinese Taipei national team with a scoreless 10th.

[citation needed] Van Kampen struggled in the 2008 European Cup in Grosseto as the worst pitcher on Kinheim, which won the title.