Chan Ho Park felt a tug in his right hamstring while warming up in the bottom of the sixth inning last night and did not pitch.

The righthander thought it was "mild''; he met with the team doctor last night and will do so again today. He might need an MRI.

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Park was slated to pitch the seventh inning. When he couldn't go, manager Joe Girardi left David Robertson in.

If Park has to go on the disabled list, the Yankees could add lefthander Boone Logan from Triple-A Scranton/Wilkes-Barre.