Sammy Sosa hit his 500th carreer HR tonight, in a slugfest 10-9 loss to the Cincinnati Reds. It was a solo shot in the 7th off Scott Sullivan.

In his pursuit of Aaron, Sosa now needs five seasons of 51 HR. At any age, that would be a tremendous five year span. Of course, he's more than done that over the previous five. If he averages 40 HR a year, however, he will need over 6 years of that production. He's got a good shot. The key is how quickly he ages.