Ali Howard, daughter of former USA goalkeeper, commits to the Lady Vols.
O'Hara was part of a golden era for USWNT.
Chelsea and Tottenham square off in a massive London derby at Stamford Bridge on Thursday as both teams need a win to boost their European hopes.
Former United States defender Kelley O'Hara, a double Women's World Cup winner and 2012 Olympic gold medallist, said Thursday she will retire following her club campaign.O'Hara played in four Women's World Cups, the first in 2011, and was a three-time Olympian.