Alvarado and Sherman took the fourth race with heavy favorite Newport Lulu, who paid $3.00 after running off to a seven-length victory in a six-furlong contest for fillies and mares.
The duo came back to win the sixth race with Skyspy, who returned $11.20 after upsetting 1-to-2 favorite Summer Haze by one length in a six-furlong dash for 3-year-olds.
Sherman is fourth in the trainer standings with 30 victories. Jerry Hollendorfer, who also saddled two winners Thursday, leads his colleagues with 52 training wins. Hollendorfer took the third race with Shawklit Sundae ($7.60) and the seventh with Devilish Denae ($10.60).
Jockeys Catalino Martinez and Leslie Mawing also had riding doubles Thursday. Martinez won the fifth race with Venadita ($20.60) and the seventh with Devilish Denae. Mawing took the third race with Shawklit Sundae and the eighth with Defensive Move ($6.40).
Racing continues at Golden Gate Fields Friday. Post time is 12:45 p.m.