Just because someone pitched terribly doesn't mean that they gave up rockets. With the way Rivera was pitching, he's lucky he only gave up 4 singles, although the line drive to end the inning would have been extra bases if it got by Teixeira. You admit his location was poor and his movement was off. That basically means Rivera was throwing 91 mph straight fastballs down the middle as the graphic indicates. That's terrible pitching, even if it was a rare bad performance from Rivera.