Ukraine are currently facing Czech Republic in their Billie Jean King Cup tie and with the national anthems played before hand, Marta Kostyuk burst into tears singing it.
Kostyuk lost out in her first match against Marketa Vondrousova, but has spent the last year almost being a spokesperson for Ukrainian tennis amid the war and the response that the tours have given.
It seems in this case, it just got too much for Kostyuk in representing her country which remains war-torn.