Murray clinched only his second victory on clay at an ATP event

Murray, 19, mixed up the pace to upset big-hitting Frenchman Gael Monfils 6-4 6-1 and claim only his second ATP clay-court victory.

The young Scot will next play American James Blake, who beat Carlos Moya.

But Rusedski, who had replaced Murray as Britain's number one, was crushed 6-1 6-1 by Gilles Simon of France.

Just one day after leapfrogging Murray in the ATP rankings, the world number 40 won just two games in the rain-hit clash at the Rothenbaum Club.

I played pretty solid and I knew what I wanted to do Andy Murray

The 32-year-old held his serve at the start but disintegrated shortly after as his 21-year-old opponent took just 19 minutes to race through the first set.

Despite a rain delay, Rusedski failed to stop his rapid slide, winning just the fourth game of the second set and offering little resistance as Simon went on to easily claim victory.

Earlier, Murray bounced back from a recent poor run with an accomplished performance against in-form Monfils in the battle of the teenagers.

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It was the pair's first meeting in a senior event and came after world number 29 Monfils reached the semi-finals of last week's Rome Masters, where Murray went out in the first round.

But on a breezy day in Hamburg, the Scot used a variety of slices and short balls to unsettle the Frenchman, who held just three of his service games.

"I played pretty solid and I knew what I wanted to do," he said afterwards

"He's the sort of player who likes to sit back and play a lot of topspin. He doesn't go for too much when it's level and I was trying to go for a bit more off my forehand.