Daniel Ricciardo vowed to pounce on any Mercedes mistakes at Spa and that's exactly what the "calm and in control" Australian did, according to Christian Horner.
While the Merc duo of Nico Rosberg and Lewis Hamilton had their own personal battle, the Red Bull driver came from fifth on the grid to win the Belgian Grand Prix - his third win of the season after Montreal and Hungary - and reduced the gap to Championship leader Rosberg to 64 points.
His team principal Horner feels "he is doing a phenomenal job" to stay in the title hunt despite not having the best car on the grid.
"We've benefited from a get-together between the Mercedes drivers, so it is good to be keeping them honest," said Horner.
"Spa was a track where we didn't expect to be competitive, yet we managed to win, as in Montreal - two of the most unlikely tracks we would have picked pre-season.
"All we can do is focus on ourselves and go race by race, but it is remarkable Daniel has won only one less race than Rosberg (three compared to four) this year.
"He is doing a phenomenal job at the moment and deserved his victory.
"Everything we see of him is incredibly calm, in control and he is obviously marking himself out as a clear Championship contender."
While it is quiet on the Red Bull front in terms of team-mate battles, Rosberg and Hamilton continue to make headlines as their rivalry heats up and Horner, for one, has welcomed the drama.
"It is good for F1 those guys are racing each other because they are both racing for the World Championship," he added.
"They have a big lead over everybody else so it is right they do push each other hard."
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