Grading cards has become a common practice among collectors as card values rise and third-party assessments of condition become more important. GemRate reports that 16.8 million cards are projected to be graded annually by PSA alone, with 1.45 million cards graded in October. The article highlights the most graded sports cards of all time, including Ken Griffey Jr., Michael Jordan, Mark McGwire, Barry Bonds, Jerry Rice, Connor Bedard, Nolan Ryan, Reggie Jackson, Sandy Koufax, Henry Aaron, Roberto Clemente, Jim Brown, Julius Erving, and Bobby Orr.