The shuttle between the Astros and Triple-A Round Rock has been very active this season, even on the position player side.



Designated hitter Yordan Alvarez, outfielder/shortstop Myles Straw, outfielder Derek Fisher, infielder Jack Mayfield and catcher Garrett Stubbs have each been promoted from the Pacific Coast League to the majors at various points in the season.



Touted outfield prospect Kyle Tucker, however, has been stuck in Triple A all year. Although his 24 homers and OPS north of .920 would be enough to garner a call-up on many teams, the Astros have no clear spot for him on their major league roster and might not until rosters expand in September.



Tucker is blocked by Michael Brantley in left field, Josh Reddick in right field and Alvarez at DH. The Astros seem intent on holding on to the former fifth overall draft pick beyond the July 31 trade deadline, as they still consider him a potential everyday corner outfielder of the future. But a...