HOUSTON -- The Astros placed outfielder Josh Reddick on the seven-day concussion disabled list Wednesday and called up outfielder Derek Fisher, their No. 4 prospect as ranked by MLBPipeline.com, from Triple-A Fresno prior to Houston's 13-2 win over the Rangers.
Fisher started in left field and went 2-for-3 with a homer, two walks and two RBIs in his Major League debut.
• Astronomical: Fisher makes big splash
Reddick's stint on the DL, which is retroactive to Tuesday, stems from a minor headache he reported to Houston's training staff shortly after colliding into the right-field fence in the second inning of Monday's loss to Texas.
"First and foremost is the health of Reddick," Astros manager A.J. Hinch said. "It's not healthy for us to continue having this hang over his head and hanging over our team. So we made the decision to put him on the DL. The decision to bring Fisher up really rests on the fact that he's been the best player in the league. He's been incredible for the first couple months."

Fisher found out late Tuesday night he'd be promoted to the Astros. A left-handed bat like Reddick, he was added to Houston's 40-man roster Wednesday. In a corresponding move, the Astros transferred right-hander Jandel Gustave (right forearm tightness) to the 60-day disabled list.
"I was pretty shocked," said Fisher, whose family flew from the Pennsylvania/New York area to see his MLB debut Wednesday. "I was so surprised, I really didn't know what to do. Obviously, the first thing I had to do was go call my family. … For me to be here with the team that we have is pretty unbelievable."

Fisher, 23, was hitting .335/.401/.608 with 16 home runs, 45 RBIs and 13 stolen bases in 60 games at Triple-A Fresno. Fisher hit safely in 16 of his past 17 games, and he led the Grizzlies with 25 multihit games.
The 6-foot-3 Fisher was drafted No. 37 overall by Houston in 2014 out of the University of Virginia. He's the second member of Houston's '14 Draft class to reach the big leagues with the Astros, joining second-round pick A.J. Reed.
Fisher had started 37 games in center field, 11 in left field, six in right field and six at designated hitter in Fresno before being selected to the Astros for the foreseeable future.
"He can come up here and get a taste of what the big leagues is like," Hinch said. "It could be a short stay for him, given that Reddick could be out in the minimum number of days for the concussion DL. Or maybe not -- I guess that's always an option as well. Whether it's one day, three days, five days, 10 days, whatever the opportunity that presents itself, we want to give it to the best player. And the best player right now is Fish."
Reddick becomes the fourth Astro and only position player to be on the DL since May 25. He is Houston's third player to be placed on the concussion DL in 2017 after Brian McCann's seven-day stint from May 20-27 and Jake Marisnick's from April 25-May 1.
Here are the Astros on the DL:
Position players
• Josh Reddick (concussion), Tuesday
Pitchers
• Lance McCullers (back discomfort), Friday
• Dallas Keuchel (neck discomfort, inflammation), June 5
• Charlie Morton (right lat strain), May 25
• Jandel Gustave (right forearm tightness), April 19
• Collin McHugh (right shoulder tendinitis), March 30

Fantasy spin | Fred Zinkie (@FredZinkieMLB)
Fisher has been one of the most productive players in the Pacific Coast League this season, hitting .335 with 16 home runs, 45 RBIs, 42 runs scored and 13 steals in 275 plate appearances. Having flashed the potential to be a five-category asset, the 23-year-old can be scooped up in 15-team leagues on the expectation that he will be given a chance to prove himself while Reddick deals with a mild concussion. Also, those in shallow formats should be ready to nab Fisher if he enjoys immediate success.