Mercedes endured a disappointing time at the Mexico City Grand Prix but team boss Toto Wolff celebrated the ‘underperformance’ of a rival given he personally benefits. The Silver Arrows ended Sunday’s race in fourth and fifth place after Lewis Hamilton passed teammate George Russell late on. But Mercedes were only 10 seconds away from a podium finish after Ferrari pitted Charles Leclerc late on to set the fastest lap of the Mexico City GP. Ferrari brought the Monegasque in for a fresh set of soft Pirelli tyres to steal the extra point off McLaren as the Scuderia strengthened their bid for the …