Borussia Dortmund hit a goal and missed a penalty during a goalless draw at home to Barcelona in the opening round of Group F in the Champions League in the first appearance of Lionel Messi this season with the Spanish champions.
Even as the Argentine landed, the German side remained the most dangerous side and captain Marco Royce missed a penalty saved by goalkeeper Mark Andre Ter Stegen.
Ter Stegen blocked two attempts from Rios, while Julian Brandt hit the ball in the 77th minute.
Dortmund waited 25 minutes for the first good chance when Torgan Hazard passed to Rios in the box but Ter Stegen thwarted the danger.
Luis Suarez pushed into the box to seize a rare opportunity to raid Roman Birki but the keeper was treated well.
Dortmund were awarded a penalty after a foul on Sancho and Reus shot but Ter Stegen continued to shine against the German captain.