Not really a two horse race is it, unless you mean 3rd in a two horse race where the 3rd horse had won the league and reached the champions league final in 2014 , a year and a bit before he arrived. Also that same season that 3rd horse finished 3 points behind the champions, and reached the champions league final again. Atleti are genuine challengers. Finished 2nd last season again.
Fairly impressive of Man City to win the league at an absolute canter last season by not even being a 'horse' when they had went even longer than Atleti did (not considered a 'horse' 18 months after winning the title) imo.