Jari-Matti Latvala locked out Rally Mexico's Saturday morning loop by topping all three stages and extending his lead over Sebastien Ogier by an additional 41.9s.
The Finn's only scare came in SS11 when he touched a rock and was subsequently concerned about resulting suspension issues, but his Polo R WRC escaped the incident without damage.
Despite being unable to compete with Latvala, who still had a favourable starting position, Ogier confidently maintained second.
While closest challenger Dani Sordo was close to the championship leader in all three stages, the Spaniard's gap over fourth-placed Andreas Mikkelsen shrank to 14.9s as he suffered from engine problems.
Mads Ostberg inherited fifth from Hayden Paddon when the Hyundai competitor damaged his suspension in SS12 and lost several minutes as a result.
He still salvaged sixth with the Fords of Ott Tanak, Martin Prokop and Lorenzo Bertelli completing the top nine.
Teemu Suninen holds 10th and a massive lead in the WRC2 class, while Thierry Neuville and Eric Camilli both failed to recover from their respective Friday troubles and crashed.
Standings after SS13:
|Pos.||Driver / Co-Driver||Car||Time/Delay|
|3|| Dani Sordo
|9|| Lorenzo Bertelli