The 37-year-old is one of quartet of nominees short-listed for the award, having become the first double round-Jersey swimmer in July last year.
Truscott completed the 132-kilometre double circumnavigation of the Island in 22 hours and seven minutes. The first leg was completed in ten hours and 35 minutes and the second in 11.32.
The Jerseyman, an advertising executive, said: ‘I was completely gobsmacked when I found out about it after seeing it on Facebook.
‘It’s good to be recognised for something which is a hobby and something I love doing.
‘The other three nominees have all done equally amazing swims as well and I could not have done mine without an amazing team behind me and I thank them for their support.
‘The Global Marathon Swimming Federation selected the final four for the solo swim of the year award and now it’s down to the [GMSF] members to vote and that will be competed in the next few weeks.
‘Jersey swimmers punch above their weight and everyone has their own Everest and the people I’m up against, and others who did not make the short-list, should be congratulated for their great achievements.’
Should Truscott finish top, he would follow in the footsteps of Jersey’s 2013 winner Wendy Tréhiou, whose outstanding female solo marathon swim was a two-way crossing of the English Channel (68 km), in 39 hours and nine minutes.
Tréhiou also won the GMSF’s Yudovin Award for most adventurous swim in 2015 for her St Malo to Jersey swim, a distance of 56.3 km completed in 24 hours and 25 minutes.
Jersey’s Sally Minty-Gravett, MBE, made the solo swim of the year short-list in 2016, when she became the oldest person to complete a two-way English Channel crossing, in 36 hours and 26 minutes, at the age of 59 and 45 days.
The solo swim of the year award has been combined, male and female, for the first time this year.
Truscott is up against South Africa’s Cameron Bellamy, the first person to circumnavigate Barbados (90 km), Spain’s Tita Lorens, who made the first Ibiza to Spain crossing (90 km) and USA 14-year-old Vera Rivard, the youngest to swim the length of Lake Memphremagog.