David O'Sullivan is an American ten-pin bowler

Ten-pin bowling

Ten-pin bowling is a competitive sport in which a player rolls a bowling ball down a wooden or synthetic lane with the objective of scoring points by knocking down as many pins as possible.-Summary:The lane is bordered along its length by semicylindrical channels Ten-pin bowling (commonly just...

 and was the 2007 U.S. Amateur champion. O'Sullivan earned the title at the 2007 USBC

United States Bowling Congress

The United States Bowling Congress is a sports membership organization dedicated to ten-pin bowling in the United States. It was formed in 2005 by a merger of the American Bowling Congress, Women's International Bowling Congress, Young American Bowling Alliance, and USA Bowling...

 Team USA Trials in January, 2007, which also put him on Team USA for the first time. As a member of Team USA, he won medals in five of six events at the Men's American Zone Championships contested in Guatemala

Guatemala

Guatemala is a country in Central America bordered by Mexico to the north and west, the Pacific Ocean to the southwest, Belize to the northeast, the Caribbean to the east, and Honduras and El Salvador to the southeast...

 in May, 2007.

O'Sullivan made the quarterfinals of the 2007 World Ranking Masters

World Ranking Masters

The World Ranking Masters is Ten-pin bowling's international ranking system, as with professional Tennis. It is governed by the World Tenpin Bowling Association ....

, losing to eventual tournament winner Stuart Williams

Stuart Williams (Ten-pin Bowling)

Stuart Williams, from England, is one of the world's leading Ten-pin bowlers. He is one of the most active tour players in the sport. Williams, along with the store owner father Dave, runs a Ten-pin Bowling Pro-Shop at Chester Megabowl, called MCS Bowling ....

of England.