John L. Sullivan

Maureen Connolly Little Mo She was the first woman and the youngest tennis player ever to win the Grand Slam -- the four-in-a-row Australian Open, the French Open, Wimbledon and the U.S. Open -- and one of only five players to do so. Her name was Maureen Connolly, but to adoring fans she was "Little Mo." Born in San Diego on September 14, 1934, Connolly was just 18 … [Read more...] about The Greatest Irish Americans of the Century: Sports