Heston (undisclosed) made his fifth rehab appearance Tuesday for one of the Giants' rookie-level Arizona League affiliates, tossing a scoreless inning.

Heston opened the season at Triple-A Sacramento, covering 3.1 innings in an April 9 start. He has been sidelined with the injury ever since, though he appears to be closing in on a return from the 7-day disabled list after beginning his rehab assignment June 20.

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