J.D. Martinez hits 4 home runs in one game for the first time in Diamondbacks history

He's the second person to do it this year. J.D. Martinez, traded to Arizona before the non-waiver trade deadline in July, became the first Diamondbacks player ever to hit four home runs in the same game. He's the second person to do it this year, after Scooter Gennett did it back in early June. That's only the second time that's happened even: back in 2003 Mike Cameron and Shawn Green accomplished the feat only a few weeks apart in the season. It's only the 16th time in MLB history that a player...