Taveras, also a lefthanded hitter, sat out the right-field start for little-used Shane Robinson, another righthanded hitter, but Matheny indicated Taveras might not have played anyway.Matheny said before the game, Taveras “has a lot to learn. He’s got a lot of things he needs to improve on in every aspect of his game.”Regardless of his .206 average, some of that improvement falls into the category of baserunning/hustle. On Wednesday, Taveras, running from first with two out on a sixth-inning double by Jay, first watched the right fielder and then made a poor turn at second and didn’t pick up much speed going to third, where coach Jose Oquendo had to stop him, even with pitcher Justin Masterson coming up next.“The aggressiveness wasn’t there,” Matheny said.Masterson rescued this failing by singling to score Taveras but in a subsequent at-bat, Taveras didn’t get to first quickly enough for Matheny after being frustrated at grounding to first base with two runners on and the rookie nearly was doubled up.Matheny said he understood Taveras’ frustration, to a degree. “He wants to do his part. He wants to have a big at-bat there. But your part is to get to first base as fast as you can,” Matheny said.There have been “plenty of conversations since,” said Matheny, referring to Taveras and the Cardinals’ staff. “Those (are reminders) that that stuff isn’t going to work because we’re here to win on every out, on every play. Every turn on the bases means a lot.”Matheny added: “He’s got people around here that are willing to teach if he’ll be accessible in thinking about the game. He could view it as a day off or he could view it as an opportunity to get better, just like every other one of our guys.“There’s a group of guys who are going to go about it with everything they’ve got. We just need everyone else to be doing the same.“Our job is to try and continue to teach. And sometimes, there are tough lessons. He gets it. But getting it and applying it ... those are steps.”Asked if Taveras might be back in the lineup against a righthander tonight, Matheny replied, “We’ll see.”