Playing for only the ninth time this season, Marshall hit 124 not out as Hambledon piled up 341-5 before rushing Tichborne Park out for 91 to win by 250 runs. He made a career-best 154 against Fareham & Crofton in mid-summer.
But with Fawley defeating Hythe & Dibden in the Waterside derby, Hambledon had to settle for a third placed finish.
The scene was set for left-hander Marshall after Will Bond (50) and Portsmouth Grammar School’s Chris Pratt (46) had provided Hambledon with a century start.
They dropped from 121-1 to 185-5 (James Long 4-51), but that was as good as it got for Tichborne, who failed to take another wicket.
Marshall, with 23 fours in his 124, and Australian Luke Barber (51*), with a half-century on his Dons farewell before returning to his native Melbourne, took control with an unbeaten sixth-wicket stand of 166 which carried Hambledon to 341-5.
Due to some untimely weather interjections, Tichborne had seen four of their previous six matches cancelled.
No surprise then their ring rusty batsmen were rushed out for a meagre 91 (Lachan Jess 29), with Will Parvin taking 4-40. They ended the summer eight points behind promoted Fawley and, like Tichborne Park, lamenting the number of games – four in their case- los to the weather.