The outfielder was recalled from triple-A Salt Lake on Sunday and started in right field for the Angels. He singled and walked in five plate appearances against Seattle.
"These guys have been playing great baseball," said Blash, 28, who appeared in 99 games with San Diego the past two seasons. "It's been fun to watch. I was just looking forward to helping this team at some point."
On opening day, Calhoun, batting fifth, had three hits, including a home run and a triple in his first two at-bats.
He has not had an extra-base ever since; each of his past 17 hits were singles.