Baseball: Cal Ripken, Jr., Alex Rodriguez, Pudge Rodriguez, Rafael Palmeiro, Joe Clark, Mark McGwire, Dave Winfield, Reggie Jackson, Nolan Ryan, Roger Clemens, Pedro Martinez...too many to think of. I know I'll have to amend this list.
Basketball: Michael Jordan, Magic Johnson, Kareem Abdul Jabbar, Larry Bird, Hakeem Olajuwon, Patrick Ewing, Mark Aguirre, Rolando Blackman, Dirk Nowitski, Michael Finley, Steve Nash, Jason Kidd, more when I remember.
Hockey: Eddie Belfour, Mike Modano, Brett Hull, Patrick Roy, Peter Forsberg, Chris Chelios, Sergei Fedorov, Steve Yzerman, Mario Lemieux, and more when I look through my stubs.
football: Walter Payton (playoff game), Emmitt Smith, Troy Aikman, Michael Irvin, Barry Sanders (MNF), Roger Staubach, Tony Dorsett, Drew Pearson, Brett Favre (playoff), John Elway, Fran Tarkenton (NFC Championship), Steve Largent, Eric Dickerson (playoff when he was a Ram), Earl Campbell, OJ Simpson (as a 49er), Joe Montana (as a Chief), Terry Bradshaw, Franco Harris, Art Monk, Darryl Green, Joe Theisman (lots of times, but '79 final game, we kicked his BUTT), Phil Simms, Jim Kelly, Thurman Thomas, Harvey Martin, Randy White, Lee Roy Jordan, Cliff Harris, Ed "Too Tall" Jones, Dan Marino, Bob Griese, Archie Manning, Dan Fouts, Dieon Sanders, Larry Allen, and many more. I have had season tickets to the Cowboys in 1977, 1978, 1979, 1992, 1993, 1994, 1995. So, I've seen most of the great players in those two eras at Texas Stadium.