Peterson has 12 hits in a team-high 27 at-bats, including a triple and a home run, and four RBIs. Surely he's making the A's offseason decision to protect him from the Rule 5 Draft and place him on the 40-man roster look like the right one.
"It's unbelievable," manager Bob Melvin said. "It seems like we're talking about him every day. It seems like he gets two good at-bats every day, and whether it's against lefties or righties, it doesn't matter. He hustles, runs hard, plays very hard."
On cue, Peterson picked up another two hits in Tuesday's 8-2 loss to the Royals, while also making his first start of the spring in left field. He had previously been used primarily in the later innings.
The 25-year-old, drafted by the Cardinals in the second round of the 2008 First-Year Player Draft, began 2012 at Double-A Midland for the second consecutive season, but finished it by hitting .389 in 38 games with Triple-A Sacramento. Overall, he finished with .326 average, nine home runs and 46 RBIs in just 86 games, after missing time at the beginning of the season with a sprained right ankle. He reached base safely via hit or walk in 78 of those games.
"We saw his numbers last year, didn't get to see him first-hand, but now we are," Melvin said, "and he's making big impressions."
Peterson can also play first base, and that added versatility could make him a prime target for a promotion this season should the A's need help at the big league level. Until then, he'll get his at-bats at Sacramento once camp concludes.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.