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7/31/2014 10:10 P.M. ET

Marte set to begin Triple-A rehab assignment

PHOENIX -- Starling Marte is headed to Indianapolis and a rehab assignment that could have him back in the Pirates' outfield within a week.

On the concussion list since July 23, Marte will follow a detailed agenda with the Triple-A Indians that calls for him to get 16-20 at-bats through Tuesday, after which his situation will be reassessed.

Marte accompanied the club here from San Francisco, then detoured to Pittsburgh, delaying his first rehab game until Saturday.

According to manager Clint Hurdle, Marte is due to have four at-bats on Saturday, play a full nine innings in left field each of the next two games, then serve as the DH on Tuesday.

"Then we'll re-evaluate where he is," Hurdle said.

Marte wound up on the concussion list five days after taking a fastball on the helmet from Colorado right-hander Adam Ottavino on July 18, in the first game coming out of the All-Star break.

Worth noting

• Manager Clint Hurdle confirmed that Gerrit Cole (sore lat) will make his second rehab start for Triple-A Indianapolis on Saturday.

• Yes, Josh Harrison and Barry Bonds now belong in the same sentence: With his four-game homer streak from the top of the lineup, through Wednesday, Harrison became the first Pittsburgh leadoff batter to compile such a streak since Bonds set the club record in 1987.

First number, last word

.301 -- Jordy Mercer's batting average since May 31 and entering Thursday's game -- tops among Major League shortstops; the Cardinals' Jhonny Peralta was second among National Leaguers at the position, at .275.

"I didn't have a crystal ball saying he would be in the position he is now. But I didn't think he'd just be hanging on, either. I felt it was an important year for us to evaluate him. We've got a much better read on things." -- Hurdle on Josh Harrison, who before the end of July has reached career highs in every offensive category and has driven in more runs (37) than the last two years combined (30).

Tom Singer is a reporter for MLB.com and writes an MLBlog Change for a Nickel. He can also be found on Twitter @Tom_Singer. This story was not subject to the approval of Major League Baseball or its clubs.