PORT ST. LUCIE — It was only one inning consisting of 17 pitches, but Rick Porcello received a taste Saturday of competing in a Mets uniform.
Two weak singles, including a broken-bat shot by Garrett Cooper, produced a run against the veteran right-hander, who later admitted he wasn’t ready for the Marlins’ running game — Monte Harrison stole second and third base against him.
“Today was a good first step in the right direction and there is some differences from the American League game to the National League game,” Porcello said on a day the Mets lost 5-3 to the Marlins in the Grapefruit League opener at Clover Park.
“I saw it today, the running game, they don’t really steal bases that much in the American League and you get out there and first pitch with a runner on first and he’s gone. I will start paying attention to that more and be prepared for a little bit of change in the style of play, but the main focus is building that foundation with that delivery and go from there.”
Porcello, who spent 11 seasons pitching for the Tigers and Red Sox, arrived in December on a one-year contract worth $10 million. He is battling for a spot in the Mets’…