Walter Johnson pitched 5,914 and a third innings for the Washington Senators from 1907 to 1927, with 417 wins, which is second only to Cy Young's 511.
Well, I can't swear they're the worst of the worst but the 1930 Philadelphia Phillies hold the MLB record for highest team ERA in a season at 6.71. That season, Les Sweetland pitched 167 innings to an ERA of 7.71 (record was 7-15) and Claude Willoughby pitched 153 innings to an ERA of 7.59 (record was 4-17). Jim Walkup of the 1937 St. Louis Browns pitched 150 1/3 innings to an ERA of 7.36 and record of 9-12. His career 6.74 ERA over 462 1/3 innings is the highest in MLB's modern era for pitchers that threw at least 400 innings in a career. More recently, Jose Lima had a 6.99 ERA in 168 2/3 innings (record was 5-16) for the 2005 Kansas City Royals and a 6.65 ERA in 196 1/3 innings (record was 7-16) for the 2000 Houston Astros.
That would be Will White of the 1879 Cincinnati Reds who pitched in 680 innings. Since 1900, the most innings pitched in a season is 464 by Ed Walsh of the Chicago White Sox in 1908. Since 1950, the most innings pitched in a season is 376 2/3 by Wilbur Wood of the Chicago White Sox in 1972.
The Red Sox record is 45 shutout innings by Cy Young of the 1904 team. During this streak he pitched 25 1/3 hitless innings, still a major league record. The American League record for shutout innings is 56 by Walter Johnson of the 1913 Washington Senators.
Cy young
Mike Mussina pitched 152 innings for the Yankees in 2007. His record was 11-10.
The New York Yankees Mariano Rivera holds the all time Post season record of 33 1/3 scoreless innings pitched. Whitey Ford holds the World Series record with 33 consecutive scoreless innings pitched. Christy Mathewson pitched 27 consecutive scoreless innings in a single post season as he threw 3 shutouts in the 1905 World Series.
Brad Ziegler Oakland Athletics 2008 32 innings still going
The all time MLB record is 680 innings by Will White of the 1879 Cincinnati Reds. White pitched 75 complete games that season and had a record of 43-31 with a 1.99 ERA.
That is Will White of the 1879 Cincinnati Reds who pitched in 680 innings. He started 75 games and had a record of 43-31 with a 1.99 ERA, gave up 676 hits, walked 68, and struckout 232. He pitched 75 complete games, every game he started he completed.
Brandon Webb in 2007 with 42 1/3 consecutive scoreless innings.
Cy Young had 316 career losses. He also had the most wins, complete games, innings pitched, and pretty much every other career record associated with longevity.
The MLB record was set by Oakland A's pitcher Brad Ziegler with 27 scoreless innings on Sunday July 27, 2008. The record of 25 scoreless innings was previously held George McQuillan of the 1907 Philadelphia Phillies.