Toro Rosso’s Brendon Hartley has selected 28 as his permanent number in Formula 1.
Hartley made his debut in the United States in place of Pierre Gasly, with the Frenchman competing in Super Formula, and ran with 39, one of Toro Rosso’s reserve numbers.
Hartley has been retained for this weekend’s Mexican Grand Prix, and is set to complete the remainder of the campaign, with Daniil Kvyat dropped from Red Bull.
Hartley will take up use of 28, last run by former Manor Marussia racer in the 2015 campaign.
“I'm so excited to head to Mexico for my second Formula 1 Grand Prix,” said Hartley.
“It was a steep learning curve in Austin last week, so I'm looking forward to putting some of the lessons learnt into practice this weekend here in Mexico.
“It's a tricky venue for the engineers, as the high altitude plays havoc on downforce and cooling, but from a driving point of view it's a great track and one I really enjoy.”
Hartley finished his Grand Prix debut in 13th position at the Circuit of the Americas.
