Allan Massie: Glasgow capable of troubling mighty Sarries

You struggle to reach a Wimbledon quarter-final for the first time and you find you are up against Roger Federer or Andy Murray. This, as it were, is where Glasgow find themselves tomorrow, playing the European and English champions, Saracens, at Allianz Park. Saracens have never lost a European match there: played 12, won 12. In the Champions Cup, as in the Six Nations, it’s hard to win away from home. Few do so, nobody yet at Allianz Park.