India, June 5 -- She walked off without turning back, pausing only to wave and blow kisses to a crowd draped in Ukrainian flags. There was no handshake. There was no joint photo with the ballkids. There was, by now, nothing unexpected about any of it.

Marta Kostyuk had just lost her first match on clay in nearly two months, eliminated from the French Open in straight sets by Russia's Mirra Andreeva, and the absence of the customary net greeting made explicit what the tennis had already made uncomfortable: that for Kostyuk, competing against a Russian opponent at a Grand Slam is not a sporting occasion. It is a negotiation with conscience.

Andreeva won 6-1, 6-3 in 76 minutes Thursday on Court Philippe-Chatrier, ending Kostyuk's 17-match...