Phelps won the men's 200m free with a time of 1:47.73. Phelps edged out Peter Vanderkaay (Rochester, Mich.), who finished second in 1:47.77. Ryan Lochte (Daytona Beach, Fla.) was third in 1:49.05. Phelps' second win came in the 100m fly with a time of 52.41. Tyler McGill (Champaign, Ill.) was second in 53.15 and Tim Phillips of Ohio Swimming was third in 53.91.
Soni's meet record came in the women's 100m breast with her time of 1:05.90. She was followed by Justine Mueller (Monroe, Mich.), who was second in 1:08.66, and Corrie Clark (Malvern, Pa.), who was third in 1:09.63.
In the women's 200m free, Knutson set a meet record and edged out Chloe Sutton (Mission Viejo, Calif.) to win in 1:57.83. Sutton was second in 2:00.24 and Canada's Barbara Jardin was third in 2:00.42.
Beisel won the women's 400m IM and set a meet record with a time of 4:39.32. Knutson, who set the meet record in the event in 2009, took second in 4:44.51. Mueller also picked up her second medal of the night, placing third in 4:48.78.
Natalie Coughlin (Vallejo, Calif.) picked up her first gold medal of the meet with a win in the women's 100m fly. Coughlin swam a 58.46 for the win. Felicia Lee (Wayne, N.J.) was second in 59.99 and Lauren Smart of SwimMAC was third in 1:00.32.
In other races, Austria's Hunor Mate won the men's 100m breast by just three one-hundredths with a time of 1:01.66. Eric Shanteau (Lilburn, Ga.) was second in 1:01.69 and Mark Gangloff (Akron, Ohio) was third in 1:01.97. North Baltimore's Todd Patrick won the men's 400m IM with a time of 4:22.96. Alex Vanderkaay (Rochester, Mich.) was second in 4:27.82 and Metro Miami's Carlos Omana was third in 4:27.95.
The Grand Prix Series serves as an opportunity for swimmers to race against some of the best competition in the country, as they continue their preparation for the 2010 ConocoPhillips National Championships (3-7 Aug) and the 2010 Pan Pacific Championships (18-22 Aug), both of which will take place in Irvine, Calif. Remaining stops in the Grand Prix series include Santa Clara (17-20 Jun) and Los Angeles (8-11 Jul).