Big-spending Anzhi Makhachkala's poor start to the Russian Premier League season continued when after losing 1-0 at home to surprise package Rostov.
Gabonese forward Guelor Kanga was the hero of the encounter scoring the only goal early in the second half, beating Anzhi's goalkeeper Vladimir Gabulov from 20 metres with the aid of a deflection, as Rostov went provisionally top of the table four matches into the campaign.
With ten points, Rostov are a point ahead of the country's most successful club Spartak Moscow, who take on Kuban Krasnodar on Sunday.
"We expected Anzhi to hold the initiative in this match and were prepared to play on the back foot," said Rostov's Montenegrin coach Miodrag Bozovic.
"We withstood the pressure in the first half and then our goal, which came via a lucky ricochet, took the wind from their sails."
Anzhi splashed out upwards of €50m over the close-season on the likes of Aleksandr Kokorin, Igor Denisov and Christopher Samba, making them the fourth biggest spending club in Europe.
As a result, they were considered by many as the favourites to win the title ahead of the season's start, but recently saw veteran coach Guus Hiddink depart with his fellow Dutchman Rene Meulensteen taking his place.
And now the club from Dagestan are still winless after four games, a run of form that leaves them in 13th in the league table.
Spartak can go back clear at the top if they win in Krasnodar to maintain their perfect start to the campaign, while champions CSKA Moscow face Rubin Kazan on Sunday.