July 4 1907 — Canadian world heavyweight boxing champion Tommy Burns KOs Bill Squires of Australia in round 1 in Colma, California, his 6th title defense. 1910 — Jack Johnson knocks out Jim Jeffries in the 15th round at Reno, Nev., to retain the world heavyweight title and spoil Jeffries’ comeback. 1914 — The Harvard eight wins the Grand Challenge Cup to become the first American crew to capture the top event at the Henley Royal Regatta.