The Hanshin Tigers have made a couple of modifications to the infield at Koshien Stadium, once in January 2016 and again in June 2017. In both cases, the infield dirt area was expanded, about one meter in 2016 and around two meters this year, to improve fielding conditions.
The Tigers wanted similar changes made to the stadium they use during spring camp and approached Ginoza Stadium officials. Their request was accepted and construction began in October and ended in November. The modification cost about five million yen.
Source: Sanspo 12/26/2017