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Rain is falling lightly on a recent Saturday at Pimlico racetrack in Baltimore, Md., and the groomed dirt is starting to getting wet. The racetrack condition reads "muddy" on the infield's digital scoreboard and the bettors assembled along the railing take note, scribbling on their daily racing entries, changing bets.

Inside, jockey Sheldon Russell takes note, as well. The rain will mean less work for him this afternoon.

The 23-year-old professional jockey from England, who has ridden on the Maryland circuit since 2007, slips into his white riding pants and patterned silks before picking up the day's program of races in his locker. He studies it and wipes a smudge off his shiny black boots.

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