Mercedes boss Toto Wolff says his team returned to its “old form” at the United States Grand Prix, which he believes acts as the highlight from its championship-winning 2019 Formula 1 season.

The German manufacturer claimed its ninth 1-2 finish of the campaign as Lewis Hamilton sealed his sixth world title with a second-place finish behind teammate Valtteri Bottas in Austin. Bottas also scored Mercedes' first pole since July's German Grand Prix, ending a four-month drought for the team. 

Mercedes had already clinched its sixth straight championship crown in Japan and has now become the first team in F1 history to win six straight world championship doubles.

“Every championship seems like the hardest, it’s maybe because we are protected by our memory, but certainly this year had its ups and downs,” Wolff said.

“We came out of the blocks very strong, didn’t have the quickest package on Saturday for a long time but we are able to make the least mistakes on a Sunday. That was probably the biggest key in making us win the championship.

“For me, the highlight is Austin. We came back to old form, winning a title decider with Valtteri and winning the championship with Lewis with strong pace is for me the highlight of the season.”

Hamilton’s latest title triumph moves him just one championship shy of Michael Schumacher’s all-time record of seven.

Asked if he believes Hamilton can go on to match Schumacher, Wolff replied: “There is a reason why the Schumacher record stands - because it’s very difficult.

“If we’re able to provide the drivers with a good car next year that is competitive, we continue to work on the gaps we still have, try and minimise the mistakes and he has a good season, there is no reason why he couldn’t go for a seventh title.

“He just drives cars bloody fast,” Wolff added. “It’s where talent meets a big push for self improvement all the time.

“And that combination, the background, makes him stand out in his generation.”