It will not have gone unnoticed that Synek looked unconvincing in his quarter-final, needing a late surge to finish third ahead of Belgium's Tim Maeyens in fourth, but it would be dangerous to underestimate him.
New Zealand crews were to the fore again last night on Lake Bled and expectations are high they will once again be among the medals later in the regatta.
Julitte Haigh and Rebeccas Scown, the defending champions in the women's pair, were dominant in winning passage to their final but will need to beat an excellent British pair to claim another gold.
Graham Oberlin-Brown and James Lassche qualified for the final after finishing third in their semifinal of the men's lightweight pair - a non-Olympic event - while Storm Uru and Peter Taylor, the 2009 world champions in the lightweight men's double sculls, also qualified for the semifinal after winning their quarter-final ahead of Great Britain.
The men's coxless four of Jade Uru, Ben Hammond, James Dallinger and Chris Harris and lightweight women's double sculls crew of Lucy Strack and Louise Ayling both progressed to the semifinals through repechages last night.
The men's eight, who surprised many by qualifying for the final of last year's event, couldn't repeat the feat after finishing sixth in their semifinal.
The world championships double as Olympic qualifiers, making progression to the final important to virtually ensure a place in London.