Toto Wolff has demanded Mercedes must become relentless in its pursuit for Formula 1 glory after the slip up in Hungary.

After enjoying the F1 summer break, head of Merecedes-Benz motorsport Wolff says his team cannot afford to become complacent again after suffering its worst results last time out at the Hungaroring since the new regulations were introduced.

Lewis Hamilton and Nico Rosberg were sluggish off the start line for the second race in succession and were leapfrogged by both Ferrari drivers before Hamilton ran off the track and slipped back to tenth in a nightmare opening lap. Working his way through the pack Hamilton was once again in the wars when he collided with Daniel Ricciardo at turn one after the safety car period and eventually finished sixth.

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Rosberg also suffered a turn one incident with the Red Bull driver with five laps remaining, causing a tyre puncture which dropped him out of contention for the win to finish a frustrating eighth place.

Reflecting on Mercedes' overall performance during the first half of the 2015 season Wolff says the team has made significant improvements on last season, aside from the blip in Hungary, but the gap to its rivals has reduced.

"With ten races down and nine to go, we enter the second half of the season with a stronger points total than at this stage last year and yet our margin to the competition is actually smaller," Wolff said. "There is never a moment you can take your foot off the gas and Hungary proved once again that any slip is an opportunity our rivals will grab with both hands.

"We have all enjoyed a chance to recharge over the summer - but we have also kept our minds focused on what lies ahead. There are still many chances to win or lose this battle and we must be relentless in our push to come out on top."

Mercedes return to the scene of a disappointing race in 2014, when Rosberg and Hamilton collided during the Belgian Grand Prix, forcing the Brit to retire from the race while his team-mate recovered to take second place behind Red Bull's Ricciardo.