Toto Wolff feels Mercedes era of dominance isn't expected to last indefinitely but is determined to see the F1 world drivers' championship go down between Lewis Hamilton and Nico Rosberg.

The Mercedes team principal has overseen a three-season span of utter dominance which totals at 43 Grand Prix victories over the past 50 races - counting back to the start of 2014 and the beginning of the V6 hybrid era.

Such control over the F1 championship, arguably only matched by Ferrari in the early 2000s, is seen by Wolff as one which is unlikely to last - whether that is in reference to the end of this season or with nod to 2017 ahead of the regulations revamp - but is confident Mercedes is capable of maintain its moment into the current world title battle.

"We return from the summer break with fresh energy for the next phase of the season - and we will need all of that energy, as time and again we're reminded that nothing is clear cut," Wolff said. "We were expecting Hungary to be tough, with Hockenheim playing more to our strengths. That wasn't the case.

"It's an unusual situation to be winning for so long, so you can't expect it to last - especially against opposition with such passion and resource as those around us."

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With Mercedes holding a controlling 156 point advantage in the F1 world constructors' championship, while both Hamilton and Rosberg are comfortably in front of the chasing pack, Wolff is confident the drivers' title will be decided between his drivers but feels it is all to play for over the final nine races of the year.

"We will continue to fight hard. For the drivers, it's the same story," he said. "There are more than 200 points to be won in their title battle and a lot of racing to be done yet. Lewis is on an impressive run, just like Nico had at the end of last season and into this one. The advantage constantly swings, so it will be exciting to see how their battle pans out."

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