In addition to what James said, Tyler Kepner mentions that only one player has hit more home runs than A-Rod in the first seven games - ever. That'd be Mike Schmidt in 1976 with 7 HR. That included a 4 HR game.

One common thread? Larry Bowa had a front row seat in both situations. He was the Phillies' shortstop.

Edit: Actually, it is historic: no Yankee has ever done it.