Furious Cronulla coach Chris Anderson claimed his side had forgotten how to win after the luckless Sharks lost 18-12 to Melbourne in the National Rugby League match at Olympic Park.

Cronulla had two tries disallowed as they went down to the Storm for the second time in five weeks.

Rookie sensation Billy Slater was again the Melbourne hero with two tries, including a spectacular 70m effort in the second half.

Former Melbourne halfback Brett Kimmorley set up the Sharks' first two tries, but he was later ruing three missed conversions in a match where both teams crossed three times.

In an error-riddled affair it was somehow appropriate that Storm winger Marcus Bai, who had made at least as many mistakes as anybody, was on hand to score the winning try in the 73rd minute.

"It was (there to be won), it was disgraceful," said Anderson, whose team is yet to win in four attempts this season.

"We improved in some areas - I thought our defence was strong all night.

"We just gave them three stupid tries.

"When you're down on confidence you don't know how to win the game and we didn't know how to close the game out."

Tries from Paul Franze and Phil Bailey had the Sharks ahead 8-6 at the interval despite a 24th minute effort by winger Nick Youngquest being disallowed by video referee Phil Cooley for a marginal knock-on by front rower Jason Stevens.

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