Aug. 6 1958 — Glen Davis of Columbus, Ohio, sets a world record in the 400 hurdles with a time of 49.2 in Budapest, Hungary. 1966 — Muhammad Ali knocks out Brian London in the third round to retain his world heavyweight title. 1972 — South African Gary Player wins his second PGA golf championship with a two-stroke victory over Jim Jamieson and Tommy Aaron. 1978 — John Mahaffey beats Tom Watson and Jerry Pate on the second playoff hole to win the…