Before batting practice Tuesday David Robertson said he was going to test the left hamstring by playing catch and if all went well was hopeful to throw off a mound. The Yankees setup man played catch with Mariano Rivera in left field during batting practice and threw in the bullpen. He said there was “no problem and hoped to pitch last night.’’ Following a 2-0 loss to the Rockies manager Joe Giradi said Robertson, who didn’t pitch, was available. Robertson hasn’t pitched in a game since a week ago today when he felt a tweak in the back of the knee when he broke toward first on a grounder hit to the right side. * Brett Gardner had six hits in the last 14 at-bats and was hitting .267 (12-for-45) against lefties, but wasn’t in the lineup against the Rockies left-hander Jorge De La Rosa. “I was going to give one of my lefties off today and I chose Gardy,’’ said Girardi, who used Ichiro Suzuki in center and the right-handed hitting Ben Francisco in right field. “I know it’s a small sample, but [Ichiro’s] numbers against lefties are as good as anyone on our team.’’ Ichiro entered the game hitting .382 (13-for-34) against lefties and was hitting .381 (16-for-42) in the last eight games. Last night, he went 1-for-4 against De La Rosa and fellow lefty Rex Brothers. Gardner entered the game as a pinch-hitter for Ben Francisco in the seventh and went 0-for-1 with a walk.