The Old Trafford meeting against Fiorentina got to the end of the 90 minutes level courtesy of a Simon Sohm opener and a Robin Gosens own goal, so penalties were needed to separate the two sides.
With each side having scored all four to that point, La Viola's Fabiano Parisi stepped up and powered an effort to Bayindir's right, but the Turkish gloveman dived the right way and got a strong hand to the shot to deny the Italian substitute.
It laid on the perfect opportunity for Kobbie Mainoo to seal the win with our fifth penalty, and that's precisely what he did, delivering the pre-season silverware following Bayindir's assistance.