He has also played in Nippon Professional Baseball (NPB) for the Hiroshima Toyo Carp and in the CPBL for the Rakuten Monkeys.

[8] He made 30 appearances (20 starts) split between the Double–A Montgomery Biscuits and Triple–A Durham Bulls, accumulating a 9–10 record and 3.23 ERA with 96 strikeouts across 133+2⁄3 innings pitched.

[12] On February 16, 2018, Hagens returned stateside and signed a minor league deal with the Arizona Diamondbacks.

[13] He made 21 appearances split between the Triple–A Reno Aces and rookie–level Arizona League Diamondbacks, but struggled to a combined 7.23 ERA with 50 strikeouts in 61 innings.

[14] On April 1, 2019, Hagens signed with the Fargo-Moorhead RedHawks of the American Association of Independent Professional Baseball.

He made 12 appearances (11 starts) for Fargo, logging a 4–3 record and 3.43 ERA with 64 strikeouts across 60+1⁄3 innings pitched.

[19] On September 20, 2021, Hagens set a CPBL record with 25 consecutive scoreless appearances without allowing a run.

In 2023, Hagens appeared in 50 contests for Rakuten, pitching to a 3.26 ERA with 42 strikeouts and 13 saves across 58.0 innings of work.