Jockey Patrick Valenzuela first came to Del Mar as a fresh-faced, 16-year-old apprentice, and though both he and Del Mar have matured in the three decades since, both retained their youthful enthusiasm on opening day on Wednesday.
Prospective rebounded from a second-place finish in last month's Sam F. Davis Stakes and put himself on the Kentucky Derby trail with a three-quarter-length victory over Golden Ticket in Saturday's Grade 2, $350,000 Tampa Bay Derby.
Valenzuela's next opportunity with Burns occurred in Saturday's La Jolla Handicap and this time the 48-year-old jockey chose to keep his mount on the rail, closing from third in the final furlong to win over 1 1/16 miles on turf.
The absence of Mr. Commons from Saturday's $150,000 La Jolla Handicap at Del Mar because of a bruised foot will make Santa Anita Derby winner Midnight Interlude the favorite in the turf race over 1 1/16 miles for 3-year-olds.
After a third in his 2011 debut in an allowance race for sprinters at Hollywood Park in June, Tres Borrachos started as an outsider in Saturday's $200,000 San Diego Handicap, and won his first graded stakes since the Grade 2 Swaps Stakes in 2008.
Zazu was behind pacesetter Wallstreeter and Kentucky Oaks winner Plum Pretty on the final turn of Saturday's $147,000 Hollywood Oaks when jockey Joel Rosario decided he would stay inside in early stretch.