Legendary baseball player Mark McGwire's 1999 Upper Deck Black Diamond Piece of History Mark McGwire PSA 9 POP3 No 10’s! trading card has surfaced on the secondary market with a price tag of $3,000.

Mason McGwire, Mark's other son, finds his power on the mound, not at the plate, with a fastball in the mid 90s, and a nasty split finger change.

CardsHQ breaks down the value of a Tom Brady 1/1 patch card, Ken Griffey auto, and Mark McGwire auto, as he decides if he should complete the deal for $1050.

The PSA 10 Rookie Cards of Mark McGwire, Roger Clemens, & Kirby Puckett continue to command top dollar four decades after they first hit shelves.