The shortstop, who had an RBI single off Josh Tomlin in his only at-bat, in the second inning, said after the game he felt better and that he first felt off during batting practice. He left in the middle of the fourth inning.
"I felt kind of dizzy and my heartbeat was kind of fast, a little shaky. But now I'm good," Scutaro said. "It started in BP. Then I came up here, I ate something and felt kind of good, but when the game started I started kind of feeling like that again, but it wasn't as bad as BP time."
With Scutaro unsure of what triggered the episode, manager Terry Francona said he didn't want to take chances.
"He was real light-headed. A little bit of an elevated heart rate," Francona said. "He was checked here and checked out fine. We'll get him checked out a little bit more tomorrow. That's not something you want to play with."
Scutaro's been hot of late, with multihit games in his previous two contests entering Monday. His average since the All-Star break is .310.