Here is a roundup of SI.com's 10 most popular stories this week. Be sure to read to the bottom for a bonus story from the SI Vault.
After his appearance on David Letterman's final Late Show, Broncos quarterback and frequent Letterman guest Peyton Manning pens a tribute to the longtime host.
In a new SI.com series, retired mixed martial artist Julie Kedzie explains what it feels like to cut weight for an MMA fight.
With the draft order set, it's officially mock draft season. Who will be picked first? Will the Knicks mess things up? How many Kentucky players will be taken in the lottery? SI.com's latest mock draft has the answers. By Chris Mannix.
After winning racing's rarest trifecta, Mario Andretti's business ventures are thriving. In his post-racing life, the 75-year-old Andretti is an eclectic entrepreneur with an estimated net worth of $100 million. By Andrew Lawrence.
Gwen Bush hadn't spoken to Jim Harbaugh in years when she called the coach to ask about her son, Wayne Lyons, transferring to Michigan. That call earned Lyons a spot on the Wolverines' team and Bush a job on the staff. By Andy Staples.
The NFL appears eager to plant a team — maybe two — in Los Angeles. The murky question is which team(s) it will be. By Austin Murphy.
The Royals received criticism for their approach to the off-season, but with the success of a number of Kansas City's free-agent signings, general manager Dayton Moore is getting the last laugh. By Ben Reiter.
Branded a "box safety," Landon Collins tumbled out of the NFL draft's first round. The Giants now plan to help Collins prove what he's been saying all along: He'll have no problem covering in the pass-happy NFL. By Jenny Vrentas.
Few things in sports beat the white-knuckle glory of overtime in the NHL playoffs. By Steve Rushin.
Even as ALS has taken his ability to walk and speak, former Ravens linebacker O.J. Brigance seems to have never stopped smiling. He shows up to work five days a week as the Ravens' senior advisor for player engagement, showing all those around him what it means to push on. By Jeff Bradley.
Muhammad Ali retained the heavyweight championship of the world by knocking out Sonny Liston with a perfectly valid, stunning right-hand punch to the side of the head, and he won — despite speculation to the contrary — without benefit of a fix. By Tex Maule.