Phillies second baseman Chase Utley has struggled because of issues with his right knee, according to general manager Ruben Amaro Jr. Utley has been inconsistent offensively this season. "I think part of it is [Utley's] inability to keep his leg strong during the course of this time," Amaro said. "He wasn't able to do as many things with his legs, which is probably the most important part of hitting, strength-wise. I think that has something to do with it. But he's still a very dangerous hitter. I think he's a great hitter. He wasn't producing with the power he has. I think it has something to do with the strength of his lower half." Utley opened the season on the disabled list because of tendinitis in his right knee. He returned to the lineup, but he hit just .259 with 11 home runs and 44 RBIs in 454 regular-season at-bats.