This week at Golden Gate Fields

Schedule: Thursday through Sunday Post time: 12:45 p.m. Feature races: Grade 3, $100,000 San Francisco Mile on Saturday; $100,000 Campanile Stakes and $100,000 Silky Sullivan Stakes on Sunday

Update: Alert Bay, who won the San Francisco Mile in 2016, and G. G. Ryder, who won it in 2015, head a field of seven entered Wednesday for the 2017 edition. Alert Bay has won 13 of 30 starts with $1,168,555 in earnings, and G. G. Ryder has won 12 of 34 starts with $531,095 in earnings. From the rail out, the field consists of G. G. Ryder, Stryker Phd, Patentar, Many Roses, Camino Del Paraiso, Alert Bay and Star Student. Alert Bay, Star Student, G. G. Ryder, Stryker Phd and Many Roses were the first five finishers in a prep race on the main track April 2. The San Francisco Mile is on the turf, and Star Student reportedly will be scratched unless weather forces a switch to the main track — which seems unlikely, according to the forecast. Camino Del Paraiso, who hasn’t raced since Nov. 12, was supplemented to the SF Mile at a cost of $2,000 after not being an original nominee. … Sunday’s stakes for 3-year-olds are part of the Golden State Series for California-bred or Californiasired horses, with purses enhanced by the California Thoroughbred Breeders’ Association. Entries for both 1-mile grass races will be drawn Thursday, with two-time sprint winner Lucky Christiana heading the Campanile, and El Camino Real Derby runner-up More Power to Him topping the Silky Sullivan. Neither horse has raced on grass, although More Power to Him broke his maiden in an event switched from turf to the main track because of wet weather. … Weekend purses also are enhanced for maiden races (to $31,000 from $26,000) and for firstlevel allowance events (to $37,000 from $27,000).

Elsewhere: Santa Anita had to cancel Thursday’s program because of insufficient entries. … Spring-summer seasons open Friday at Belmont Park and Saturday at Churchill Downs, where the 143rd Kentucky Derby will be run May 6.