Australia's Alex de Minaur saved several match points to beat Germany's Alexander Zverev in the Laver Cup.
De Minaur won 2-6, 7-6, 11-9 to drag Team World back into contention against their European opponents.
Team World was leading the Laver Cup 5-3 heading into the evening matches.
Helping drag Andre Agassi's side back into the three-day event at London's O2 Arena, the Australian maintained his 100 per cent singles win record against Europe in Laver Cup duels, fighting back to defeat double grand slam champ Zverev 2-6, 7-6, 11-9.
"If you can notice, my blood is red as well," De Minaur said, smiling at how Team World's scarlet shirts had seemed to reflect his bloodied right leg, which he had hurt when making the tumbling Boris Becker-like volley on his way to winning a point in the match tie-breaker.
His victory on Sunday morning AEST put Team World into the lead after Europe's 3-1 overnight lead had evaporated when American Learner Tien outlasted Italy's Flavio Cobolli in a baseline slugfest to secure a 6-3, 2-6, 10-7 victory in the opener to the second day.
Even then, Zverev missed his big chance, serving for the match and a straight-sets win at 5-4 in the second stanza only to cough up two double faults that allowed de Minaur to break and level the match on a tiebreak.