Best Career W-L %s AT ONE TIME

Whereas most career record totals only increase as a career progresses, not so with batting averages, ERAs and winning percentages. These often peak fairly early in a player's career, then decline, sometimes moreso near the end of one's career. Baseball-reference now has a "cumulative" feature that gives a players cumulative stats up to that point at the end of each season. Using that, I thought it would be interesting to compile, to start with, the best AT ONE TIME won-loss percentages for pitchers(though not necessarily staying that way to the end of the career).

Since baseball-reference only requires 100 decisions to be include on their won-loss pct. career leaderboard, I used that as my first minimum, but also compiled one for those with 150+ wins, since that is rather arbitrarily the lowest number a starting pither can get and still hope to be considered for the Hall of Fame (Dizzy Dean made it with that number of wins)

Best AT ONE TIME winning percentages, minimum 100 decisions

1. .765 Bill Hoffer (78-24), ended up 92-46 (.667)
2. .741 Whitey Ford (80-28), ended up 236-106 (.690)
3. .739 Johnny Allen (85-30), ended up 142-75 (.654)
4. .736 Bob Caruthers (106-38), ended up 218-99 (.688)
5. .729 Spud Chandler (78-29), ended up 109-43 (.717)
5. .729 Ed Reulbach (78-29), ended up 182-106 (.632)
7. .725 John Clarkson (100-38), ended up 328-178 (.648)
8. .724 Ron Guidry (76-29), ended up 170-91 (.651)
9. .722 Dwight Gooden (91-35), ended up 194-112 (.634)
10..716 Larry Corcoran (101-40), ended up 177-89 (.665)
10..716 Johan Santana (78-31), is currently 112-52 (.683)
12..712 Lefty Grove (195-79), ended up 300-141 (.680)
12..712 Dave Foutz (89-36), ended up 147-66 (.690)
12..712 Lefty Gomez (89-36), ended up 189-102 (.649)
12..712 Pedro Martinez (166-67), is currently 214-99 (.684)
16..709 Vic Raschi (107-44), ended up 132-66 (.667)
17..708 Charley Radbourn (165-68), ended up 309-195 (.613)
17..708 Tim Hudson (80-33), is now 146-77 (.655)
19..703 Mike Mussina (71-30). is now 270-153 (.638)
20..700 Don Newcombe (112-48), ended up 149-90 (.623)


Best AT ONE TIME winning pct., minimum 150 wins:
1. .732 Bob Caruthers (175-64), ended up 218-99 (.688)
2. .720 Whitey Ford (216-84), ended up 236-106 (.690)
3. .712 Lefty Grove (195-79), ended up 300-141 (.680)
3. .712 Pedro Martinez (166-67), is currently 214-99 (.684)
5. .708 Charley Radbourn (165-68), ended up 309-195 (.613)
6. .694 Ron Guidry (154-68), ended up 170-91 (.651)
7. .692 John Clarkson (220-98), ended up 328-178 (.648)
8. .688 Juan Marichal (170-77), ended up 243-142 (.631)
9. .685 Christy Mathewson (263-121), ended up 373-188 (.665)
10..683 Grover Alexander (192-89), ended up 373-208 (.642)
11..681 Mordecai Brown (169-79), ended up 239-130 (.648)
12..679 Randy Johnson (224-106), is currently 296-162 (.646)
12..679 Roger Clemens (152-72), ended up 354-184 (.658)
14..676 Kid Nichols (276-132), ended up 361-208 (.634)
15..673 Larry Corcoran (177-86), ended up 177-89 (.665)