Manager Robin Ventura said Roberton's recent struggles can not be attributed to the leg injury that bothered Robertson in the first half of the season, the Chicago Tribune reports.

EDGE Analysis

Robertson blew his second save in as many nights Wednesday, and he is now just 4-for-8 in save chances since the All-Star break. His velocity has remained similar to that of earlier in the season and of previous seasons. However, batters have a .958 OPS against him over his last 11 innings, and his striekoeut rate on the season is a career-worst 10.1 per nine. Robertson is in no immediate danger of losing his role, but he may no longer be the steady source of saves he once was.