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How a Goldman Sachs slide could shape Adir Shiffman's Sleeping Duck lawsuit

Lawyers for Melbourne investor Adir Shiffman have laid out their opening arguments in his court dispute with Sleeping Duck, as a 10-day trial gets under way.

Sleeping Duck showroom. Sleeping Duck website.

Prominent Melbourne investor Adir Shiffman's legal battle with e-commerce mattress startup Sleeping Duck will hinge in part on the interpretation of a slide deck prepared by Goldman Sachs for potential investors in the company.

One of the slides refer to Shiffman as "executive chairman" of the company and was among the evidence presented by his lawyers in court today as the proceedings in the closely watched dispute got under way.

While Shiffman's barrister Michael Borsky told the Supreme Court of Victoria on Monday that the executive chairman label was "not strictly right as a lawyer would read it, [commercially] that's true".

Borsky told the court that the case would rest on three key propositions. First, that Shiffman "helped transform Sleeping Duck from a struggling small time business into a very successful and valuable business," he said during his opening arguments.