In 29 games with the Giants, Slater compiled a slash line of .290/.343/.430 with three home runs, 13 RBIs and 13 runs scored.
"He made some noise," Bochy said Sunday. "He showed that he can hit Major League pitching in a small sample size, obviously. He had some good at-bats. He did a good job in left field. He's a smart kid and seems to figure out each level in a short time. He was doing that here."
Slater's injury continued an unsettling trend of injuries to Giants prospects -- including infielder Christian Arroyo, who's recovering from a broken hand.
"These kids are part of our future," Bochy said. "It's a tough break for them and us in the fact that we're not going to get a chance to give them some playing time."
• A stiff back kept catcher Buster Posey out of Sunday's lineup. He had mustered two hits in his previous 11 at-bats. Elected by fans to start Tuesday's All-Star Game presented by Mastercard, Posey faced the challenge of managing his discomfort through a long cross-country flight.
• Bochy named right-hander Johnny Cueto to start Friday in San Diego when the regular season resumes, followed Saturday by Madison Bumgarner -- assuming the left-hander responds with resilience to his Minor League injury rehabilitation start Monday with Class A Advanced San Jose.