[1][2] In 2009, Borch won the bronze medal in the double sculls at the World U23 Championships in Račice with Truls Albert in bow seat.

[3][4] In 2010, Borch became part of the Norwegian senior men's squad and partnered with Nils Jakob Hoff.

[7] The duo won the bronze medal in the men's double sculls at the 2016 Summer Olympics in Rio de Janeiro.

[11][12] He was selected to represent Norway at the 2020 Summer Olympics and won the silver medal in the men's single sculls in Tokyo.

He competed in the men's double sculls with Martin Helseth at the 2024 Summer Olympics in Paris, where the pair finished in overall tenth place.