He refused or stopped the ball 10 times
Barça won 1-0 the second leg of Champions League round of 16 at Camp Nou against Manchester City. The final result would have been much wider if the goalkeeper from the Sky Blue, Joe Hart, had not performed in a very high level. He saved 10 possible goals. On this graphic by ESPN you can see the goalkeeper's performance:
Joe Hart already had an outstanding performance in the game, as he saved a penalty shot by Messi. This time in the second leg he refused shots by Messi, Neymar, Suarez, Iniesta and Jordi Alba, as you can see in the video below.
The performance of the Englishman aroused praise. On one hand, the words of Messi, one of the victims of his performance: "It's a great goalkeeper. He had an awesome day. He stopped everything. He is a phenomenon." On the other hand, Ter Stegen's congratulations: