Giants Notes: Marrero hopes to be back; Posey faces Romo

SAN FRANCISCO — About 45 minutes after the Giants announced that Chris Marrero had been designated for assignment, the left fielder walked up to the locker of one of the newcomers. Marrero patted Christian Arroyo on the back and shook his hand, congratulating him for his first call-up to the big leagues.

“That’s my boy,” he said later. “I was really happy for him.”

The Arroyo promotion and the addition of Drew Stubbs signaled the end of Marrero’s April run in the lineup. He was cut and Aaron Hill was put on the disabled list, clearing two roster spots. Just as Arroyo forced his way up with three huge weeks in Triple-A, Marrero forced his way onto the opening day roster with a monster spring…