Zach Mettenberger entered the 2014 season with a beard that had rivaled the Texans' Ryan Fitzpatrick, but he celebrated being named the Titans' starting quarterback for Week 8 by shaving his beard, leaving a pretty sweet mustache (inset).
2 of 20Greg Nelson/SI
A clear case of never judging a book by its cover, this bearded menace of a quarterback graduated from Harvard with a degree in economics.
3 of 20Kevin C. Cox/WireImage.com
During Carolina's Stanley Cup run in 2006, defenseman Mike Commodore was in full bloom.
4 of 20Damian Strohmeyer/SI
The centerfielder's 2004 look was so simple, even a caveman could do it.
5 of 20Bruce Bennett Studios/Getty Images
Calgary Flames Lanny McDonald had a massive orange mustache in the 1980s, which matched the color of his jersey.
6 of 20Walter Iooss Jr./SI
When it comes to sideburns, few have ever rivaled the Knicks' legendary Clyde. They weren't just mutton chops, they were the whole mutton.
7 of 20Charles Krupa/AP
They say imitation is the sincerest form of flattery, so Jeff Bagwell's fellow Astros obviously liked his similarity to a very old billy goat
8 of 20Chuck Solomon/Icon SMI
The Hall of Fame closer pitched his way out of many hairy situations.
9 of 20AP
The TV analyst and National Soccer Hall of Famer was a tuft opponent during his playing days.
10 of 20AP
The product of his desire to secure a $300 bonus offered by team owner Charles O. Finley, this handlebar `stache worn by the A's closer deserves enshrinement in the Hall of Fame on its own.
11 of 20Robert Beck/SI
The Ducks enforcer has the best villain's `stache in the NHL, if not all of sports.
12 of 20Tony Tomsic/WireImage.com
The slugger's unbecoming scruff inspired his A's teammates to grow their own -- in hopes that they would inspire Jackson to shave out of his usual desire to stand out from the crowd.
13 of 20David E. Klutho/SI
The Cardinal utilityman favors the wooly bear caterpillar look
14 of 20Walter Iooss Jr./SI
The most famous Fu Manchu in sports history was later shaved off on a Noxzema commercial.
15 of 20Robert Beck/SI
Fearsome facial hair is a tradition among closers, and Gagne's goatee was pure chin music during his dominant years with the Dodgers.
16 of 20Heinz Kluetmeier/SI
Jim Kern and Sparky Lyle
Reliever Kern was known as ''The Amazing Emu'', for obvious reasons. Lyle rivaled Rollie Fingers among distinctive 'staches of the 1970s.
17 of 20Manny Millan/SI
The renegade defensive lineman looked just as natural in a biker bar as on a football field.
18 of 20Peter Gregoire/SI
Dale Earnhardt, Sr.
The mustache gave the late, legendary Intimidator an added edge.
19 of 20Al Tielemans/SI
Does the slugger's chin-strap beard keep his helmet in place?
20 of 20Focus on Sport/Getty Images
After arriving in Montreal via trade in 1978, the legendary Spaceman began growing a beard that later reached ZZ Top proportions.
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