[1] When Sorensen qualified for the 1977 Wimbledon Championships, he became the first Irishman to appear in the main draw of a Grand Slam in the Open Era.

[2] In 1980 he was a quarter-finalist at the Grand Prix event in Metz, defeating Craig Wittus and Kim Warwick en route.

[2] Later that year, Sorensen played at Wimbledon for a second time, but was again unable to reach the second round, losing to Patrice Dominguez.

[2] He had one of the best wins of his career in the 1984 German Open, where he upset Sammy Giammalva Jr.[2] The man who won that tournament, Juan Aguilera, a top 20 player, would be defeated by Sorensen in a Davis Cup match that year.

The Irishman was a member of the team which competed in the World Group in 1983, playing ties against Italy and the United States.