Walsh was also rewarded by kennelmate Timmy Trumpet finishing a bold second, three-lengths behind.
The dominance display by the Walsh prepared runners was clearly illustrated by the seven length margin back to the third placed finisher Berridale Lad.
Thrilling Boris's trainer and owner Gary Harding has since decline an invitation to contest the A$145,000 Temlee event at Group 1 level in Melbourne next month.
"We want to aim Boris for the Auckland Cup and the New Zealand Derby. We'll look at an Aussie campaign after those races," Walsh confirmed.
This evening's feature Hatrick 520m race is the Wanganui Chronicle for the open class greyhounds (Race 10).
It features last Friday's brave Hatrick Classic fourth place-getter Absinthe Minded, who has drawn nicely in trap-two.
He backed up his Friday effort with a bold second in Monday's $5,000 Auckland Anniversary Day Cup at Manukau over 527m.
Looming as the biggest challenger to the Lisa Ahern trained chaser is his kennelmate Bigtime Jason.
Paul Dozer can spice up the race combos following his midfield placing in Friday's Group 1 event.
This field represents an easing in class for this Angela Turnwald-prepared greyhound, who commences this evening's meeting with 99 winners for the season listed beside her name.
Ahern is making it a no race in the national Trainers' Premiership having already mentored 326 winners which sees her maintaining a decent lead over the perennial premiership winner John McInerney, who commenced yesterday's racing sitting on 265 training successes.