2017: First win over Top 100 player In October 2017 he secured his first win over a top 100 player when he beat
Marcos Baghdatis at the Eckental Challenger. Furness reached 5 semifinals on the Futures Tour in 2017; at Poitiers, Gdynia, Troyes, Riga and Nottingham.
2018: First title on the Futures Tour In March 2018 he won his first tournament on the Futures Tour. In Faro, he defeated
David Guez in the final, winning in straight sets, In April 2018 he reached the semifinals of the Futures event in Porto but had to retire when one set apiece against
Pedro Cachin with a calf injury. He was awarded a wildcard to the
French Open qualifying. He lost to
Peđa Krstin. At the same tournament, Furness made his
Grand Slam main draw debut, where he received a wildcard into the
mixed doubles event, partnering
Fiona Ferro.
2022: First Challenger title, ATP Tour debut In April 2022, he won his first
Challenger tournament, as a qualifier, at the
Ostra Group Open, defeating
Ryan Peniston in the final. In September 2022, Furness made his debut on the
ATP Tour at the
2022 Moselle Open in Metz, France entering the main draw as a qualifier and losing in the first round to
Alexander Bublik. ==Personal life==