Later in the week, she won the 200 individual medley as well.
Tanya Williams of the United States had no problem winning the 400-yard individual medley in 4:28.48.
Earlier in the week, Carvin had won the 200-meter freestyle, the 400-meter individual medley and the 800-meter freestyle.
Sandeno previously won the 400-meter individual medley last Wednesday.
Earlier in this meet, she won the 200-yard individual medley (1:58.17) and the 100-yard butterfly (53.02 seconds).
On Thursday night, she won the 200-yard individual medley in 1:58.17.
On Thursday, she won the 200-yard individual medley in 2:00.63, breaking the meet and pool record.
On Friday night, he roared in front with 60 yards to go and won the 400-yard individual medley.
Only 28 minutes after the start the backstroke, Phelps was back in the water, winning the 200 individual medley with ease.
Joanne Marlar of Canada won the 200 individual medley in 2:13.63.