He played for Team Netherlands in the 2019 European Baseball Championship and at the Africa/Europe 2020 Olympic Qualification tournament in Italy in September 2019.

His Frisian Dutch father worked there as a diplomat,[1] where he married a Dominican nurse and has lived since 1972.

After having completed his primary and secondary education in Santo Domingo at age 17, Yntema was signed as an undrafted free agent by the San Francisco Giants in 2003.

He played in Class-A in 2008 and 2009 with the Augusta Greenjackets and Salem-Keizer Volcanoes.

He played for Team Netherlands in the 2019 European Baseball Championship, and competed for it at the Africa/Europe 2020 Olympic Qualification tournament in Italy in September 2019.