Following Rosberg's retirement, Ferrari's Sebastian Vettel became Hamilton's closest rival as the pair exchanged the championship lead throughout in a tense title fight. Hamilton registered 11 pole positions that season as he took the record for the all-time most pole positions, and his consistency (finishing every race in the points), as well as a lack of a serious challenge from his new teammate Valtteri Bottas, saw him record nine race victories and secure his fourth World Drivers' title as he overturned a points deficit to Vettel in the first half of the season, ultimately wrapping the title up in Mexico with two races to spare.