Diamondbacks Notes: Johnson, Wheeler, Davidson

Aaron Hill ranks fourth in the National League with 70 extra base hits this year. He's under contract for 2013, but there's uncertainty on the left side of Arizona's infield heading toward the offseason. Here's the latest…

• Diamondbacks GM Kevin Towers said he is pleased with what Chris Johnson has done since being acquired from Houston, Steve Gilbert of MLB.com reports. "He's hit for power,” Towers said. “He's got a nice arm over there and he's made most of the defensive plays.” Towers indicated that the Diamondbacks expect to tender Johnson a contract this offseason when the third baseman will be arbitration eligible.
• The Diamondbacks will likely rely on internal options at third base in 2013. Ryan Wheeler and Matt Davidson are alternatives at the position, Towers said.
• Shortstop is “probably more of a concern than third base" Towers said, according to Nick Piecoro of the Arizona Republic. The free agent market doesn’t feature many everyday shortstops, so the Diamondbacks could address the position in an offseason trade.