After joining the Capitals in 2003 Daniel played for the Philadelphia Freedoms in 2006 and 2007.
You'll find the league results for the Capitals and the Freedoms from those seasons right here.

Daniel won't be playing WTT during the 2010 season.

More on the WTT and Daniels former Teams you can find nevertheless on the following websites:

World Team Tennis: www.wtt.com
Sacramento Capitals: www.saccapitals.com
Philadelphia Freedoms: www.philadelphiafreedoms.com

The basic WTT-Rules:

The team which accumulates the most games after 5 events plus Overtime, if any, and Supertiebreaker, if necessary, is the winner. If the teams are tied in total games after 5 events plus Overtime, a 7 out of 13 point Supertiebreaker will be played to determine the winner. Points are counted up from 0 to 5. A Game is reached by 5 Points leading 2 Points. At 4-all a Tiebreak 5 out of 9 will be played. A match ends if the leading team wins the 5th event. Otherwise the match will go into Overtime. The Overtime ends when the leading team makes a game or the trailing team ties up. In the last case a Supertiebreaker will be played. The Supertiebreaker is a 13-Point Tiebreaker. One player per event and per gender may be substituted by the coach at the conclusion of a point.