LOL! In between sets. Awesome pic!
Actually, hey! Come to think of it, tennis was the only sport Queen Mary was known to have practised, so you never know.
To the best of my knowledge, she never rode, though she must've been taught to, don't you think?
I read that having heard as a young girl of her grandmother, Countess Claudine de Rhédey's death by having been trampled underfoot by horses (awful), she was forever after wary of horses.
Edit: "Princess Alexander", oh dear. That escaped the proofreader. And if Princess Alexandra of Kent is only 15 mos old in that photo, having been born on Christmas Day, 1936, that means Queen Mary was still in DEEP mourning for her husband in 1938! You know how much she hated wearing black.
Ahem, and since I'm being observant, that's Suzanne Lenglen curtseying to QM, circa 1919-1925, when the balletic Frenchwoman ruled Wimbledon.