Maxie Rosenbloom, Nicolino Locche, and Tommy Loughran come to mind. What did they all have in common? They couldn't punch, but you couldn't reach them with a Geiger counter. All of them have less than 20 KO's for their whole careers.
sergio mora has only 5 and yuri foreman is 26 wins with only 8 kos. and i found this guy Cesar Rene Cuenca who is 34 wins with 1 ko http://www.boxrec.com/list_bouts.php?human_id=129817&cat=boxer.
Ottka had six, Off the top of my head, I think Slapsy maxie Rosenbloom had as @ many in over 250 fights. Slappsy ws out for a good time mostly. One guy made him angry and he KO'ed him.
World Champions: Lowest % of KO's .0467 - Jack "Kid" Wolfe 5/107 - 1911-1924 (1931) --- CHAMP Jr. Feather .0551 - Corp. Izzy Schwartz 7/127 --CHAMP Fly .0638 - Maxie Rosenbloom 19/298 ---CHAMP Lightheavy .0671 - Johnny Dundee 23/343 --- CHAMP Jr. Light .0706 - Pinky Silverberg 6/85 ---CHAMP Fly .0977 - Tommy Loughran 17/174 --Champ Light Heavy .1029 - Nicolino Locche 14/136 --CHAMP Jr. Welter .1364 - Tod Morgan 30/220 --CHAMP Jr. Light .1374 - Frankie Genaro 18/131 - 1920-1924 --CHAMP Fly Most bouts without a win by kayo, career 0 of 127---Joe Marciente 1924-1940 0 of 111---Nick DeSalvo 1924-1935 0 of 88---Roy Bedwell 1986-2003 0 of 77---Peter Feher 1995-2007 0 of 77---Long Sing Que 1929-1938 0 of 70---Tommy Joyce 1971-1980 0 of 64---Robert Tartari 1949-1960 0 of 59---Johnny Sheppard 1921-1930 0 of 54---Joe Carlos Amaral 1993-active 0 of 52---Tommy Joyce 1971-1980 0 of 50---Hector McDonald 1920-1936 0 of 47---Jeremiah (Jerry) Nzelwane 1969-1979 0 of 45---Bub Anderson 1932-1940 0 0f 44---Sammy Rivers 1937-1943 0 of 43---Zuri Lawrence 1994-present 0 of 41---Clinton (C) Warren 0 of 41---Roger Flores 1992-2003 0 of 38---Phil McGrath 1958-1962 0 of 36---Phindile Gaika 1975-1988 0 of 35---Young Nasser 1957-1964 0 of 32---Eric Crumble Most Wins Without a KO: Joe Marciente 40 (0) - 66 (16) – 18 1924-1940 Herbert Stribling 34 (0) - 8 (2) – 9 1921-1934 Jean Claude LaPinte 27 (0) - 29 (3) – 10 1964-1974 Battling Jim Hayes 26 (0) - 19 ( – 4 1936-1949 Tommy Joyce 26 (0) - 23 (15) – 3 1971-1980 Zuri Lawrence 24 (0) - 14 (7) - 4 1994-present Bobby Garza 23 (0) - 21 (3) – 14 1946-1953 Jeremiah (Jerry) Nzelwane 23 (0) - 23 (2) – 1 1969-1979 Phindile Gaika 22 (0) - 13 (6) - 1 1975-1988 Young Nasser 21 (0) - 11 (3) – 3 1957-1964 Bub Anderson 21 (0) - 16 (7) – 8 1932-1940 Hector McDonald 21 (0) - 22 (3) – 6 1920-1936 Jimmy Cardew 21 (0) - 24 (0) – 2 1949-1957 Robert Tartari 21 (0) - 35 (5) – 7 1949-1960 Enrique Rodriguez Cal 20 (0) - 7 (5) – 1 1978-1985 Barend van Rooyen 19 (0) - 3 (1) – 1 1998-2003 Tim Moloney 19 (0) - 3 (2) – 4 1979-1983 Frederick Gorilla Siswana 19 (0) - 9 (4) – 2 1987-1996 Clinton (C) Warren 19 (0) - 13 (4) – 7 1923-1927 Phil McGrath 19 (0) - 18 (5) – 1 1958-1962 Johnny Sheppard 19 (0) - 32 (1) – 4 1921-1930 Peter Feher 19 (0) - 48 (32) – 10 1995-2007
Lawrence probably COULD have a KO by now, but it seems like he likes the notoriety and doesn't try to knock the guy out when he has them hurt. He had Sosnowski fighting for dear life at one point, and didn't put him away.