Dixon finished second to Simon Pagenaud in Canada on Monday (NZT), overcoming early contact and slight car damage to recover strongly.
With series pacesetter Josef Newgarden finishing fourth, Dixon was able to eat into the American driver's lead on the points table.
It was Dixon's sixth podium in 11 races and with six races left the five-time champion hasn't given up defending his title.
The Kiwi started the race 94 points adrift of Newgarden and is now 86 points behind and still in fourth place with six races left in the championship.
