Bilbao Basket (2017–2018) Following the close of his college career, Hammink was not selected in the
2017 NBA draft. He ultimately signed with
Bilbao Basket of the Spanish
Liga ACB and
EuroCup. Hammink averaged 3.9 points, 1.8 rebounds and 0.7 assists for Bilbao in the ACB.
Donar (2018–2020) On 13 July 2018,
Donar announced Hammink signed a three-year contract with the Dutch club playing in the
Dutch Basketball League (DBL). In the 2018–19 season, Hammink reached the DBL Finals with Donar where the team lost to
Landstede Hammers. In his rookie season in the DBL, he averaged 8.2 points, 2.4 rebounds and 1.2 assists. His second season with Donar, the 2019–20 season, was ended prematurely because of the
COVID-19 pandemic. He averaged 11.0 points, 4.5 rebounds and 2.7 assists in 19 DBL games. On 4 July 2020, Hammink and Donar parted ways.
Yoast United (2020) On 1 October 2020, Hammink signed with
Yoast United, newcomer in the
Dutch Basketball League (DBL). His contract included an opt-out in case he could sign with a foreign club. The season was suspended after two games due to the
COVID-19 pandemic.
Spirou (2020–2021) On November 31, 2020, Hammink signed in Belgium with
Spirou Basket.
Heroes Den Bosch (2021–2022) On June 21, 2021, Hammink signed a 2-year deal with
Heroes Den Bosch. In his first season with Heroes, he won the Dutch national championship. On August 30, 2022, Hammink and Heroes agreed to terminate his contract as he went into retirement at age 28. ==National team career==