Pitchers who recorded 20 strikeouts in a game
Roger Clemens - Wikipedia
Clemens strikes out 20 in complete game
Now 34 years later, ex-Mariners relive night when Roger Clemens
30 years ago, Roger Clemens mowed down 20 Seattle Mariners
The New York Times: This Day In Sports
35 years ago, Roger Clemens did something truly striking at Fenway
Striking Out toward Cooperstown: Roger Clemens sets strikeout
Roger Clemens Boston Red Sox 20 Strikeouts Against Seattle In
Striking Out toward Cooperstown: Roger Clemens sets strikeout
Hall of Fame countdown: Roger Clemens, dominant on the mound
4/29/86: Roger Clemens Strikes Out 20
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All-Time Boston Red Sox Roster: Roger Clemens - Over the Monster
Roger Clemens, Baseball Wiki