The 18-time Olympic champion said Thursday that he's focused on this weekend's Santa Clara Grand Prix, where he is entered in the 100-meter freestyle and 100 butterfly Friday, the 200 freestyle Saturday and the 200 individual medley Sunday. Santa Clara represents the final major event before the U.S. nationals in August when swimmers will qualify for the 2015 world championships. Former Cal swimmers Natalie Coughlin, a 12-time Olympic medalist, and multiple medal winner Nathan Adrian joins current Cal star Missy Franklin, who has four Olympic gold medals, at the event. Even after winning a record 22 Olympic medals, Phelps had difficulty staying away from a sport that has been part of his life for 22 years. In his first two meets of the Grand Prix series, Phelps swam 52.13 in the 100 butterfly to finish second in Mesa and first in Charlotte. Other than having to wake up so early, Phelps considers this the happiest time of his professional life. Phelps would like to see continued growth in the support of swimming and in making it safer for children. The sixth and final stop on the Arena Grand Prix series.